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Mission Statement 

The purpose of FLAPS-2-APPROACH is two-fold:  To document the construction of a Boeing 737 flight simulator, and to act as a platform to share aviation-related articles pertaining to the Boeing 737; thereby, providing a source of inspiration and reference to like-minded individuals.

I am not a professional journalist.  Writing for a cross section of readers from differing cultures and languages with varying degrees of technical ability, can at times be challenging. I hope there are not too many spelling and grammatical mistakes.


Note:   I have NO affiliation with ANY manufacturer or reseller.  All reviews and content are 'frank and fearless' - I tell it as I see it.  Do not complain if you do not like what you read.

I use the words 'modules & panels' and 'CDU & FMC' interchangeably.  The definition of the acronym 'OEM' is Original Equipment Manufacturer (aka real aicraft part).


All funds are used to offset the cost of server and website hosting (Thank You...)

No advertising on this website - EVER!


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If you see any errors or omissions, please contact me to correct the information. 

Journal Archive (Newest First)

Entries in FSX (78)


Wind Correction (WIND CORR) Function - CDU

Wind Correction (WIND CORR)

The approach page in the CDU has a field named WIN CORR (Wind Correction Field or WCF).  Using WIND CORR, a flight crew can alter the Vref+ speed (additive) that is used by the autothrottle to take into account headwinds greater than 5 knots. 

LEFT:  OEM CDU showing WIND CORR display in Approach Ref page (click to enlarge).

The default reading is +5 knots.   Any change will alter how the FMC calculates the command speed that the autothrottle uses.  Any change is reflected in the LEGS page. 

It's important to update the WIND CORR field if VNAV is used for the approach or of executing an RNAV Approach, as VNAV uses data from the Flight Management System to fly the approach.   However, if hand flying the aircraft, or executing an ILS Approach, it's often easier to add the Vref additive to the speed window in the MCP.  Indeed, flight crews for the most part, other than when using VNAV, leave the WIND CORR as its default (+5 knots), and change airspeed by using the MCP or by using Speed Intervention (SPD INTV).

WIND CORR Explained

The ability to increase the Vref speed is very handy if a flight crew wishes to increase the safety margin the autothrottle algorithm operates.

Boeing when they designed the autothrottle algorithm programmed a speed additive that the A/T automatically adds to Vref when the A/T is engaged.  The reason for adding this speed is to provide a safety buffer to ensure that the A/T does not command a speed equal to or lower than Vref.   (recall that wind gusts can cause the autothrottle to spool up or down depending upon the gust strength). 

A Vref+ speed higher than +5 can be inputted when gusty or headwind conditions are above what are considered normal.  By increasing the +speed, the  speed commanded by the autothrottle will not degrade to a speed lower than that inputted.


WIND CORR is straightforward to use.   

Navigate to the approach page in the CDU (press INIT REF key to open the Approach Reference page).  Then double press the key adjacent to the required flaps for approach (for example, flaps 30).  Double selecting the key causes the flap/speed setting to be automatically populated to the FLAP/SPD line. 

It’s important to understand that this is the Vref.  This calculation ALREADY has the +5 additive added; this is the speed that the aircraft should be at when crossing the runway threshold.  

LEFT:  Virtual CDU (ProSim-AR) showing the difference in Vref between a +5 and +13 Knot Wind Correction change.  Vref altered from 152 knots to 160 knots (click to enlarge).

If the headwind is greater than 5 knots, then WIND CORR can be used to increase the additive from the default +5 knots to anything up to but not exceeding 20 knots. 

Type the desired additive into the scratch pad of the CDU and up-select to the WIND CORR line.  The revised speed will change the original Vref speed and take the headwind component into account.  If you navigate to the LEGS page in the CDU, you will observe the change. 

Note that the Vref speed displayed on the Primary Flight Display (PFD) does not change.  This remains at Vref +5.

For a full review on how to calculate wind speed, review this article: Crosswind landing Techniques - Calculations, or read the cheat sheet below.         

LEFT:  Wind calculation cheat sheet (click to enlarge).

Important Varibles - Aircraft Weight

To obtain the most accurate Vref for landing, the weight of the aircraft must be known minus the fuel that has been consumed during the flight.

Fortunately, the Flight Management System updates this information in real-time and provides access to the information in the CDU.  It's important that if an approach is lengthy (time consuming) and/or involves holds, the Vref data shown will not be up-to-date (assuming you calculated this at time of descent); the FLAPS/Vref display will show a different speed to that displayed in the FLAP/SPD display.  To update this data, double press the key adjacent to the flaps/speed required and the information will update to the new speed.

Interestingly, the difference that fuel burn and aircraft weight can play in the final Vref speed is quite substantial (assuming all variables, except fuel, are equal).  To demonstrate:

  • Aircraft weight at 74.5 tonnes with fuel tanks 100% full – flaps/Vref 30/158.
  • Aircraft weight at 60.0 tonnes with fuel tanks 25% full   – flaps/Vref 30/142.

 Important Points:

  • During the approach, V speeds are important to maintain.  A commanded speed that is below optimal can be dangerous, especially if the crew needs to conduct a go-around, or if winds suddenly increase or decrease.  An increase or decrease in wind can cause pitch coupling.
  • If executing an RNAV Approach, it's important to update the WIND CORR field to the correct headwind speed based on conditions.  This is because VNAV uses the data from the Flight Management System (FMS).
  • If an approach is lengthy, the Vref speed will need to be updated to take into account the fuel used in the aircraft.  


Autolands are rarely done in the Boeing 737, however, if executing an autoland, the WIND CORR field is left as +5 knots (default).  The autoland and autothrottle logic will command the correct approach and landing speed.


WIND CORR may or may not be functional in the avionics software you use.  It is 100% functional in the ProSim-AR 737 avionics suite (Version 2).


CDU – Control Display Unit
FMC – Flight Management Computer
FMS – Flight Management System (comprising the FMC and CDU)
Vref - The final approach speed is based on the reference landing speed
Vapp – Vapp is your approach speed, and is adjusted for any wind component you might have. You drop from Vapp to Vref usually by just going idle at a certain point in the flare


Maintaining Backlighting Brightness Across OEM and Reproduction Panels

Many enthusiasts are now using Original Aircraft Equipment (OEM) panels in their simulators.  These panels are connected to Flight Simulator using a variety of interface cards.  Unless the flight deck uses all OEM panels, or all reproduction panels, there will be a difference in backlighting when the light plates are illuminated.

LEFT:  FDS-IBL-DIST-DIM.  A card that makes diming backlighting very easy.  Potentiometer is not shown (click to enlarge).

Reproduction panels, with the exception of expensive very high end types, will have exceptionally bright backlighting.  Manufacturers of reproduction panels want their panel to look good and appeal to a prospective buyer – this is why they have bright backlighting.  In contrast, OEM panels do not have  bright backlighting, and in some cases, depending upon the manufacturer of the panel, the backlighting will appear rather dim.  

Therefore, the brightness of the backlighting when using ‘run of the mill’ reproduction panels is not realistic in comparison to that observed in a real aircraft.

So how does a cockpit builder solve this conundrum of brightness if he or she has a mix of reproduction and OEM panels.  The solution is very simple – install a dimmer switch into your flight deck.

Dimmer Control

There are a number of 5 volt dimmer switches on the market and some are better than others.  For those with electrical knowledge it’s relatively straightforward to make your own dimmer switch, but what about the rest of us?  An excellent solution is the distribution board with built in dimmer control manufactured by Flight Deck Solutions (FDS).  The board keeps with the principle of KIS (keep it simple).  


The distribution board is well made, small, is fuse protected, and have the capability to connect up to 14 accessory LEDS or bulbs via propriety board connectors.  The board also can be used as a slave, meaning it can be daisy-chained to another board to increase the number items attached.

The distribution board includes a pre-wired metal potentiometer which allows all the LEDS/bulbs attached to the board to be dimmed from on to off or anywhere in-between.  The potentiometer is a standard size and fits the hole located in the panel lights panel on either a reproduction panel or an OEM panel.

One limiting feature that should be noted is that each distribution board will only support 10 amps - the rating of the fuze. 

Of more importance, the board operates flawlessly and is a very easy solution to maintaining an even brightness across reproduction and OEM panels; adjust the brightness of the reproduction panels to the same level as the OEM panels.


Connection is straightforward and requires +- 5 volts to be connected to the board.  Each LED (or bulb) that requires dim control is then connected to the board connectors.  If using an FDS panel this is very easy as the FDS panels already use the correct female attachment plugs (FDS also use bulbs and not LEDS).  Failing this, a little extra work is required to source the correct plugs and wire them to the +- wires that connect to the light plate.

Bulbs and LEDS

On another note, with the exception of late model airframes, the Next Generation B737 use 5 volt incandescent bulbs in their panels for backlighting.  This is in contrast to reproduction panels that, for the most part, use LEDS.  

The difference between bulbs and LEDS, other than construction, is the temperature they generate when turned on.  A bulb will generate considerable heat and the colour of the light will appear as a warmer hue.  A LED does not generate heat when turned on.  Therefore, an LED will have a cooler temperature and the colour of the light will be colder and more stark in its appearance.

However, before changing out all your bulbs or LEDS to maintain colour consistency, study the flight deck of a real aircraft.  Panels on all aircraft fail or need upgrading from time to time.  Therefore, it is not unrealistic o have a flight deck consisting of both LEDS and bulbs.  Airlines are in the business of making money, and pilots fly.  Neither are particularly interested in whether the ADF radio has a bulb or LED.

Additional Information

Soar-By-Wire has also discussed this subject.  Although his information relates to the Airbus, the same proceedure can be done for Boeing OEM panels.


I do not represent Flight Deck Solutions or any other manufacturer and have no received any fee or reward for discussing one of their interface components.

Further information pertaining to the distribution board can be found on the Flight Deck Solutions website.

A fellow enthusiast has written more information on his website about the distribution board as it relates to Airbus - Soarbywire.  What he has written is well worth the time reading.


Sounds Reworked - Flight Sim Set Volume (FSSV) - Review

Immersion is a perception of being physically present in a non-physical world.  The perception is created by surrounding the user of the simulator in images, sound or other stimuli that provide an engrossing total environment.  When something does not replicate its real world counterpart, the illusion and immersion effect is degraded.

LEFT:  Engine sounds will be at their highest at takeoff.

Engine Sound Output

The sound output generated by a jet aircraft as heard from the flight deck is markedly different when the aircraft is at altitude.  This is because of differences in air density, temperature, the speed of the aircraft, drag, and thrust settings.  The noise emitted from the engines will always be highest at takeoff when full thrust is applied.  At this time, the noise generated from wind blowing over the airframe will be at its lowest.  At some stage, these variables will change and wind noise will dominate over engine noise.

As an aircraft gathers speed and increases altitude, engine sound levels lower and wind levels, caused by drag, increase.  Furthermore, certain sounds are barely audible from the flight deck on the ground let alone in the air; sounds such the movement of flaps and the extension of flight spoilers (speedbrake).

Being a virtual flyer, the sound levels heard and the ratio between wind and engine sound at altitude is subjective, however, a visit to a flight deck on a real jet liner will enlighten you to the fact that that Flight Simulator’s constant-level sound output is far from realistic.

Add On Programs

Two programs which strive to counter this shortcoming (using different variables) are Accu-Feel by A2A Simulations and FS Set Volume (FSSV).  This article will discuss the attributes of FSSV (Sounds Reworked).

Flight Sim Set Volume (FSSV)

FSSV is a very basic program that reads customized variables to alter the volume of sound generated from Flight Simulator.  The program is standalone and can be copied into any folder on your computer, however, does require FSUIPC to connect with Flight Simulator.  Wide FS enables FSSV to be installed on a client computer and run across a network.  

The following variables can be customised:

(i)     Maximum volume
(ii)    Minimum volume
(iii)   Upper mach threshold
(iv)   Lower mach threshold
(v)    Engine volume ratio

Each of the variables will alter to varying degrees the Mach, engine %N1, rounded engine speed and volume percentage.  

For the program to have effect it must be opened either prior to or after the flight simulator session is opened. 

LEFT:  FSSV pop-up screen showing customised variables (default) that can be set and current reads-outs for the simulator session (click to enlarge).

It’s an easy fix to automate the opening of the program to coincide with Flight Simulator opening by including the program .exe in a batch file

A pop-up window, which opens automatically when the program is started, will display the variables selected and the outputs of each variables.  If the window is kept open, the variables can be observed ‘on the fly’ as the simulation session progresses.  Once you are pleased with the effects of the various settings, a save menu allows the settings to be saved to an .ini file.  The pop-up window can then be set to be minimized when you start a flight simulator session.  

How FSSV Works

The program reads the sound output from the computers primary sound device and alters the various sound outputs based upon customized variables.  The program then lowers the master volume at the appropriate time to match the variables selected.  FSSV will only alter the sound output on the computer that the program is installed.  Therefore, if FSSV is installed to the same computer as Flight Simulator (server computer) then the sound for that computer will only be affected.

Possible Issue (depends on set-up)

An issue may develop if FSSV is installed on a client computer and run across a network via Wide FS, then the program will not only affect the sound output from the server computer, but it also will affect the sound output from the client computer.  

A workaround to rectify this is to split the sound that comes from the sever computer with a y-adapter and connect it to the line-in of another computer, or use a third computer (if one is spare).

In my opinion, it’s simpler to install and run the program via a batch file on the server computer that flight simulator is installed.  The program is small and any drop in performance or frame rates is insignificant.


The program, although basic, is very easy to configure and use - a little trial and error should enable the aircraft sounds to play with a higher degree of realism.  However, the level that you alter the variables to is subjective; it depends on your perception to the level of sound heard on a flight deck – each virtual flyer will his or her own perception to what is correct. 

The program functions with FSX and P3D flawlessly. 

Finally, If you are unhappy with the result, it’s only a matter of removing/deleting the folder you installed the program to, or close the program during your simulator session to return the sound levels to what they previously were.  FS Set Volume can be downloaded at no charge at http://forum.simflight.com/topic/81553-fs-set-volume/.  


The below video is courtesy of the FSSV website.


OEM B737 CDU Conversion - Using SimStacks To Convert The CDU

This article follows on from an earlier post that introduced the concept of converting an OEM CDU to use in flight simulator.  The conversion has now been completed and the CDU operates seamlessly with ProSim-AR.   

LEFT:  OEM CDU fully converted and operational.  The CDU is from a classic 500 series aircraft.  Prior to my ownership, the CDU was used by United Airlines (click to enlarge)

Historical Conversion Techniques

To date, various OEM parts have been converted using Phidget cards, and to a lesser extent Leo Bodnar cards, Flight Deck Solutions system cards, and PoKeys interface cards.  Phidgets provide a stable platform, despite the disadvantage that they, at time of writing, only connect via USB to the server computer.  The primary advantage of using Phidgets is that they have been used in a wide variety of applications, are inherently stable (for the most part), and their configuration is well documented.

The conversion of the CDU was slightly different to the norm, in that a different interface system was used. 

SimStacks by Simulator Solutions

The conversion of the CDU was done in collaboration with Sydney-based company Simulator Solutions Pty Ltd.  Simulator Solutions utilise their propriety interface boards called SimStacks to convert OEM parts for use in commercial-grade simulators

SimStacks is a modular, stackable, and scalable hardware interface that is designed to integrate OEM parts into your simulator with little or no modification.    One of the many advantages in using a SimStack Foundation Board (SFB) is that the interface can connect with either the server or client computer via Ethernet (as opposed to Phidgets). 

To date, Simulator Solution’s experience has been predominately with the conversion of B747 parts and Rodney and John (owners) were excited to have the opportunity to evaluate their software on the 737 platform, with the 737 CDU being the ‘first cab off the rank’.

This article will not delve deeply into the SimStack architecture, nor will it document the wire pin-outs used with the interface card; a future post will tackle this topic in more detail. 

CDU Conversion - Choose Your Poison

There are two main camps when discussing how to convert an OEM part.  The first is to utilise as much of the original wiring and parts as possible.  The second is to completely ‘gut’ the part and convert it cleanly using an interface that connects seamlessly with the avionics software in use (ProSim-AR).  A third option, although expensive and in many respects ‘experimental’, is to use ARINC 429.

With regard to the CDU, the easiest route was option two; everything in the CDU was removed with the exception of the internal shelf divider and keypad.  In hindsight, the pin-outs of the Canon plugs could have been used, but to do so a female Canon plug would have been required, and for the use of a couple of pins, this seemed to be overkill.

Keypad and Screen

The keypad and screen are the two most important parts of the CDU, and it's vital that the connection between the keypad, screen, and the SimStacks Foundation Board is not compromised.  The actual functionality of the CDU is controlled by the avionics suite.


The keypad forms part of the lightplate in which 5 Volt incandescent bulbs are strategically located to ensure even backlighting of the keys.  Disassembling and removing the keypad from the main body of the CDU is straightforward; several small Philips head screws hold the keypad in place.  Once the keypad has been removed, any ‘blown’ bulbs can be replaced. 

Table 1: Overview of bulb location, part number and quantity.

The keypad has several wires that connect to a terminus inside the main body of the CDU.  Care must be taken when cutting the strands of wire to ensure the connection between the terminus and the keypad is not damaged.  Depending upon your skill, the terminus can be removed and a longer wire soldered to the keypad connector, or the wire can be lengthened (by splicing).  The wires from the terminus connect with the SimStack Foundation Board.

CRT and LCD Screen

The Classic CDU is fitted with a solid glass cathode ray tube (CRT) screen.  The CRT screen is approximately 2 cm thick and fits snugly within the display frame of the CDU. 

LEFT:  The CRT screen forms part of the CDU casing.  The silver coloured foil indicates the thickness of the replacement glass that needed to be ground (click to enlarge).

It’s possible to make the CRT screen operational, however,  the display would be monochromatic (green) and the screen resolution poor.  Therefore, the CRT was replaced with a custom-sized high resolution colour LCD screen.

To retrofit a replacement screen is not without its challenges.  The LCD screen is not as thick as the CRT screen, and is also not the same shape.  Therefore, the screen will not fit snugly within the display recess.  To rectify this shortfall, a piece of clear glass was ground to correctly fit within the display frame of the CDU.  This piece of glass replaces the 2 cm thick CRT glass.  The thin LCD screen was then mounted behind the clear glass in a central position.

During the design phase, it was thought that the thick piece of glass would cause a refraction problem.  However, although the theory suggests refraction will occur, the practical application has been such that any refraction is not readily noticeable.

Mounting the LCD Screen

Mounting the LCD screen can be done a number of ways.  Commercial grade double-sided sticky tape is the easiest method, but it is rudimentary.

LEFT:  LCD screen is fitted and temporarily held in position by commercial tape and a foam spacer.  Prior to revamping the CDU, this area was used to house the very large square shaped CRT screen.  Note the ribbon cable linking the screen to the screen interface card and the two white cables that connect to the screen controller card and SFB (click to enlarge).

To secure the LCD so that the screen sat firmly against the glass, thin metal plate was used to replace the open space that was left after removal of the CRT screen.  The sides of the metal plate were fabricated to push against the rear edge of the LCD.  This firmly secured the LCD screen against the rear of the clear glass.

LEFT:  The photograph shows the metal plate that was fabricated to replace the original CRT unit.  The edge of the plate pushes against the rear of the LCD screen holding the screen in place.  To remove the plate cover, 2 screws need to be removed.  It's amazing that the CRT screen required the amount of space that it did  - about 5 inches square! (click to enlarge).

Although the use of metal plate appears slightly unattractive, the plate only serves to enclose the CDU.  Once the CDU is slid into the CDU bay, the the casing of the CDU is not visible.

An alterative to using metal plate is to use ABS plastic painted the correct Boeing grey colour.

SimStack Foundation Board, External Wires and Screen Controller Card

To ensure that the CDU is standalone and will function without external inputs other than power supplies, four items need to be mounted inside the CDU.

(i)    The generic Interface card that controls the LCD screen;

(ii)    The LCD screen controller (buttons that control brightness, contrast, etc);

(iii)   The SimStack Foundation Board; and,

(iv)   The wiring to connect the keyboard to the Foundation Board.

Fortunately, there is ample room in the cavernous interior of the CDU to fit these items.

LEFT:  SimStack Foundation Board (SFB) mounted into the lower section of the CDU casing.  The SFB is responsible  for registering the key presses made on the keypad which are then deciphered and communicated to the avionics suite (ProSim-AR).  Click to enlarge.

The SimStack Foundation Board is mounted on an angular metal bracket that is attached directly to the bottom of the CDU, while the LCD interface card has been installed on the upper shelf along with the screen controller.  A ribbon cable connects the LCD screen to the interface card while a standard VGA cable connects the LCD screen to the client computer. 

The SimStack Foundation Board is Ethernet ready and requires a standard Ethernet cable (CAT 6) to connect from the card to an Ethernet switch (located behind the MIP). 

In addition to the Ethernet  and VGA cable, six power wires leave the CDU via the rear of the casing; four from the SimStack Foundation Board (5 and 12 volts +-) and two from the keypad (5 volts +-) to control the backlighting.

Toggle Switch

A standard two-way toggle switch is mounted to the rear of the CDU casing.  This switch is used to control whether the LCD screen, used in the CDU, is always on, or is only turned on when ProSim-AR is activated.  The switch is set and forget, however, access to the switch can be made from the front of the MIP or by sliding the CDU our of the CDU bay.


LEFT:  Toggle switch and wire harness leaving the base of the CDU casing.  The switch position and harness use the existing holes in the casing that were previously used by the Canon plugs.  5 and 12 volt wires are connected to appropriate busbars behind the MIP, while the VGA cable connects with the client computer.  The Ethernet cable connects into the Ethernet switch, also mounted at the front of the MIP (click to enlarge).

Power Supply

To operate the CDU requires a 5 and 12 volt power supply.  The backlighting of the keypad is powered by 5 volts while the SimStack Foundation Board and CDU operation require 12 volts.

Backlight Dimming

On my set-up, to enable the CDU keyboard to be dimmed, the 5 volt wires that leave the lower section of the CDU, are connected to a dedicated 5 volt Busbar located in the center pedestal.  This Busbar is used to connect the backlighting from all OEM panels.  The Busbar is then connected to the panel knob on the center pedestal.  The ability to turn the backlighting on and off is controlled by opening or closing a 12 volt relay (attached in line between the panel knob and Busbar).  Dimming is controlled by a dimmer circuit.

Mounting the CDU to Flight Deck Solutions MIP

The MIP skeleton and CDU bay is manufactured by Flight Deck Solutions (FDS), and is designed to fit FDS’s propriety CDU unit (MX Pro) and not an OEM unit.

The casing for the OEM CDU is much longer than the FDS CDU and measures 24 cm in length.

The FDS MIP incorporates an aluminum shelf (used by FDS to mount various interface cards) that protrudes slightly into the CDU bay.  This protrusion stops the OEM casing from sliding all the way into the bay.  To enable the CDU casing to slide fully into the bay, a small section of the shelf must be cut away.

A small metal saw is used to trim the metal away from the shelf, and although an easy task, care must be taken not to ‘saw away’ too much metal.  Once the piece of offending aluminum is removed, the casing of the CDU slides perfectly into the bay, to be secured by the DZUS fasteners to the DZUS rail.

LEFT:  Using a small metal saw, s small section of the shelf is removed.  This enables the CDU to slide into the CDU bay.  Left image is the shelf projecting into the CDU bay while the right image shows the shelf removed and covered in protective tape (to minimise abrasion).  A small notch was made at the corner to facilitate the safe routing of the wires used to enable the Lights Test (click to enlarge).

Functionality and Operation

The CDU is not intelligent; it’s basically a glorified keyboard that requires interfacing with software for functionality.  The functionality, fonts, colour, etc are provided by the avionics suite (in this case ProSim-AR, but arguably it could also be Sim Avionics or Project Magenta). 

To enable communication between the avionics suite and the SimStack Foundation Board (in the CDU casing), SimStack proprietary software must be installed.

SimStack Software - SimSwitch

SimSwitch is installed on the client computer and when configured interfaces with ProSim-AR on the server computer and the network.  Configuring SimSwitch is straightforward and involves inputting the correct static IP address and port numbers.

LEFT:  Screen grab showing SimSwitch software interface.  This is located on the client computer.  The interface, once configured, is standalone.  The software can easily be opened in minimized mode via a batch file (click to enlarge).

SimSwitch can also be used to monitor all connected OEM panels and provide debugging information if needed.

SimSwitch is a JAR archive executable file.  The file must be in operation to eanable the CDU to communicate with the avionics suite. 

The JAR file and the ProSim CDU .exe file must both be open for the CDU to function correctly.  To expedite a simulator session, the JAR file can very easily be added to a batch file for automatic loading of software prior to a simulator session.  A timer command can be added to the batch file line ensuring the JAR file opens before the ProSim CDU.exe file. 

First Officer CDU

The First Officer CDU will be converted using a similar technique, with the exception that this unit will be converted more ‘cleanly’.

(i)    A dedicated plate (rather than an angular bracket) will be fitted to the inside of the CDU casing.  This will facilitate the mounting of the SimStacks Foundation Board;

(ii)    The LCD screen controller will be attached to the inside of the casing in a more accessible area;

(iii)    The LCD screen will be fitted to customised bracket making installation easier; and.

(iv)    The LCD controller card will be fitted to the rear of the screen; and,

(v)    The Ethernet cable connector will located outside the casing.  This will provide easier access and also enable less of a tight fit when reassembling the casing.

Additional Photographs and Video

Additional photographs can be viewed in the image gallery.

BELOW: A short video demonstrating the operation of the OEM CDU using ProSim-AR. 

Main points to note in the video are:

(i)    Heavy duty tactile keys;

(ii)   The definite click that is heard when depressing a key;

(iii)  The solid keypad (the keys do not wobble about in their sockets); and,

(iv) Although subjective, the appearance of the OEM CDU looks more aesthetically pleasing that a reproduction unit.

Final Call

This conversion, by using a SimStack Foundation Board (SFB), has enabled full functionality of the OEM CDU using ProSim-AR.  The SFB can also be used to connect with other avionics suites, such as Sim Avionics and Project Magenta.  However, although the wiring of the SFB would be identical, the way in which the card interfaces and communicates with the avionics suite will differ.


ARINC429 –  A standard used to  address data communications between avionics components.  The most widely used  standard is an avionics data bus.  ARINC 429 enables a single transmitter to communicate data to up to 20 receivers over a single bus.

SFB - SimStacks Foundation Board.

Standalone – Two meanings.  (i)   Operation does not require an interface card to be mounted outside of the panel/part; and, (ii)  In relation to software, the executable file (.exe) does not need to be installed to C Drive, but can be executed from any folder or the desktop.


MCP and EFIS By SimWorld - Review

This article will review and evaluate the Mode Control Panel (MCP) and Electronic Flight Instrument System (EFIS) produced by SimWorld in Poland.  It will also briefly examine the use of the CANBUS controller system (SimBox). 

LEFT:  Mode Control Panel (MCP) by SimWorld.  The image looks impressive and the looks do not deceive as this MCP has many advantages over other panels. (promotional photograph © SimWorld (click to enlarge at super size).

The MCP will be discussed first followed by the EFIS and CANBUS system.  Where some areas overlap they will be discussed together.  I use the word panel to denote either the MCP or EFIS.  Also, OEM is an acronym for Original Equipment Manufacturer (aka real aircraft part).  

This review is not endorsed by SimWorld and is entirely my view based on first-hand experience using the MCP and EFIS.  


The mainstay for several years has been the MCP and EFIS produced by CP Flight in Italy.  For the most part, these panels have delivered consistent and reliable performance, despite their rather dated design and engineering.  

However, there are several distinct differences in aesthetics and functionality between the CP Flight units and OEM counterparts.  Furthermore, many CP Flight panels had connection problems caused by the nature of how the MCP was connected to the server computer (using a virtual communication port).  

Reason for Updating MCP and EFIS

Until updating to the SimWorld MCP and EFIS, I had used the panels manufactured by CP Flight (2015 Pro USB interface model), but technology is not idle.  The use of high-end CNC machines and electronics has enabled many parts to me made, that are in many respects indiscernible from the real item.

Initially, I attempted to find OEM panels.  Although the older non-Collins style MCP could be found, it wasn’t possible to find the newer Collins unit at an affordable price.   

SimWorld provides, at the time of writing, the closest resemblance to the OEM panels.  Furthermore, the use of the CANBUS enables trouble-free connection.


The MCP and EFIS are not inexpensive; add to this Government import charges and UPS freight and you have spent a considerable sum of money.   With an increased price comes the expectation of higher quality, reliability, robustness, and attention to detail; let’s examine how SimWorld shapes up to this maxim.

The SimWorld website provides considerable information, including photographs and a video demonstrating the MCP and EFIS.  Although imagery can save a thousand words, questions usually need to be asked.   Filip and Piotr spent considerable time answering my specific queries and e-mails were replied to in a timely manner.   Their customer focus has been top shelf in every respect.

Aesthetics, Manufacture and Detail - MCP

The Mode Control Panel (MCP) and Electronic Flight Instrument System (EFIS) are the main avionics panels used in a simulator, and most enthusiasts strive to replicate the appearance and functionality of these panels as closely as possible to the those in the real aircraft.  

Quick List Main Advantages (SimWorld MCP):

(i)         1:1 in comparison to the OEM MCP;
(ii)         Correct Boeing-grey colour;
(iii)        Screws located in the correct location on the front panel;
(iv)        Flight Director thumb stops;
(v)         Use of externally protected printed circuit boards (PCBs);
(vi)        Motorised autothrottle arming switch with automatic release to off;
(vii)       Ambient sensor (2017 MCP model, not functional);
(viii)      Does not use seven-segmented displays;
(ix)       Ability to accurately display +- and other specialist fonts;
(x)        Push to engage annunciators are backlit in green (when depressed) and are separate to the colour of the backlighting;
(xi)       Integrated backlighting uses a built-in PCB for reliable dimming control;
(xii)      Correct styled knobs made from painted aluminum;
(xiii)     Correct smoky-coloured display windows positioned in frames identical to the OEM MCP;
(xiv)     Functionality that replicates the OEM MCP (depends on avionics suite used); and,
(xv)      Use of commercial grade rotary encoders.

Internal Components

The components for the MCP and EFIS panels are for the most part machine-made; however, the components are assembled by hand on a market-demand basis.   To ensure production repeatability, SimWorld use a number of printed circuit boards (PCBs) sandwiched together to provide core functionality.

LEFT:  External casing removed showing multiple Printed Circuit Boards PCBs).  Click to enlarge.

A PCB contains numerous ‘tracks and pads’, that are used for input and output devices, memory chips and processors, and various electrical components such as resistors and capacitors.  An advantage of using PCBs is that troubleshooting can be done via a tethered computer, and if a problem is detected, a board can easily be replaced.  This is because, theoretically, each PCB for each panel is identical in design, layout and population.

System Logic and Functionality

The MCP and EFIS are a hardware-user interface that has been designed from the outset to provide full flexibility in relation to functionality.   However, although the panels may have the appropriate hardware in place, the logic to enable the functionality to operate is supplied by the avionics suite in use (for example, ProSim-AR).  

MCP Light Plate

The light plate has been professionally made and the various precut holes (cut-outs) are well finished.  The laser-engraved lettering on the light plate is precise, evenly cut, and does not differ across the unit.  Additionally, the colour of the paint is the correct Boeing gray and does not differ in hue between the MCP and EFIS light plates.

The manufacture of a light plate is quite involved, and an individual plate or batch will take on average 3 days to complete.   Prior to cutting, several thin layers of paint are applied to the light plate.  A laser is then used to engrave the required letters down to the white-coloured base layer.  The base layer is transparent to light, and when backlit, the lettering can easily be read.

SimWorld use the same technology (or very close to it), that is used to manufacture the OEM light plate.

Exterior Casing

The light plate is attached to a series of printed circuit boards (PCBs).  The PCBs and electronics are protected by a 1 mm thick exterior casing.  The casing is made from aluminum and measures 3 inches in depth perpendicular to the front of the light plate.  The casing is powder coated and coloured black.

On the rear of the panel is a female 12 Volt DC power connector, and a connection for the plug that connects the MCP to the CANBUS system.


The appearance and colour of the knobs is very similar to the OEM knobs.  Each knob, with the exception of the vertical speed wheel, is made from machine-cut aluminum and is the correct colour.  The knobs are well finished with no sharp edges, or left over metal from the milling process.   One or two metal set screws secure each knob to the shaft of the rotary encoder.

LEFT:  Detail of heading knob and bank selector pointer.  Note the detail in the window bezel and the well defined laser engraving on the lightplate (click to enlarge).

The heading knob incorporates a functional bank selector pointer (made from plastic), and the vertical speed wheel is produced from high grade molded plastic.  There are no injection holes in the plastic and the end finish passes scrutiny.

The knobs are tactile (feel solid to touch) and when rotated generate a well-defined audible click (similar to the OEM knobs on the MCP).  

Rotary Encoders

Not all rotary encoders are made equal: a high-end encoder is constructed to an exacting standard predominately using metallic components.  To rotate such an encoder requires a mild effort; there is resistance – it isn’t difficult, but you can’t move it left or right with a flip of a finger.   

In comparison, hobbyist-style encoders are considerably cheaper to purchase, are made to a less exacting standard and usually have a shaft and body produced from plastic.  The encoders are easy to rotate and can also wear out prematurely with extended use.

SimWorld use quality Swiss made rotary encoders, rather than using low quality encoders from China.  Each encoder has a cylindrical metal shaft.  A metal shaft is important as a plastic shaft can wear prematurely, in addition to becoming damaged from overzealous tightening of set screws (which hold the knob in place).

I have been told that military specification (MilSpec) encoders are available, however, SimWorld use these encoders only for high-end commercial simulators.

Resistance When Rotating Knobs - Comparison With OEM Honeywell and Collins MCP

Resistance when rotating the knobs will depend on the MCP model.  The knobs on the older Honeywell models are very easy to rotate - A finger with just a ‘tad’ of pressure will move the knobs, however, the newer Collins model has more resistance, but the knobs are still very easy to rotate with minimal force.   As one First Officer stated: ‘You can definitely hear a soft click as you move the encoders - especially on the Honeywell models’.

By comparison, the resistance felt when rotating the knobs on the SimWorld MCP, although difficult to quantify, is similar to the resistance felt when rotating the knobs on the OEM MCP – It is realistic and does not feel ‘toy like’.  


The backlighting is controlled by a number of 5 Volt light emitting diodes (LEDs).  Each LED has been strategically located in the light plate to ensure even coverage and intensity of light.  

However, the MCP does exhibit slight light bleed along the join between the light plate and the protective casing.  This is not a problem as when the MCP is mounted into the MIP, the stray light is not noticeable.  If necessary, cloth tape can be placed over the join to eliminate any stray light.

LEFT:  The stray light is at the interface where the exterior casing joins the lightplate.  This area is covered by the MIP when the panel is mounted (click to enlarge).

Backlight Dimming - Dimmer Interface Card (DIC)

The MCP and Captain-side EFIS can be dimmed together, while The First Officer EFIS is capable of being dimmed independent of the Captain side EFIS.  This is how it occurs in the real aircraft.

To enable the panel backlighting to be dimmed, SimWorld have used a dedicated PCB (DIC).  The use of a PCB ensures that dimming is reliable, accurate, and highly controllable.   The PCB is standalone, is roughly the size of two credit cards and can be mounted anywhere.

The DIC is connected to the CANBUS system via the custom wiring harness and then to the appropriate potentiometer that controls panel backlighting.   Panel backlighting can be dimmed from off to any brightness level.  

To enable dimming, a potentiometer must be wired to the PCB (DIC).  


The MCP requires 12 Volt power, while the backlighting uses 5 Volt power that is connected to the DIC.

MCP Annunciators

The annunciators are not glorified micro-switches, but are push on/off buttons that when depressed emit an audible click.  The resistance felt as the button is pressed, is slightly less than the pressure required to engage an OEM annunciator.  The square push button and frame is made from plastic, and the cylindrical shaft that the button connects with is made from metal.  

SimWorld have replicated each of the square-shaped buttons exceptionally well, and for the most part their external appearance is identical to the OEM counterpart.

Each annunciator is connected to the primary MCP PCB, thus eliminating the use of wires.  If an annunciator is broken during the course of its life, replacement is relatively straightforward and involves soldering the connection of the replacement annunciator to the PCB.

Status Checkerboard and Legend

Each annunciator on the MCP comprises a square push button, a rectangular-shaped checkerboard, and a legend.

The checkerboard is made by engraving a number of holes that, when the annunciator is pressed, enables green-coloured light to be transmitted through the checkerboard.  The checkerboard is similar to the OEM panel and has the same number of engraved holes.

Each annunciator has a legend that uses multi layer technology (proprietary to SimWorld).  Multi layer technology is what enables the backlighting of the checkerboard and legend to be a different colour.  The name of each annunciator (speed, VNAV, N1, etc.) has been engraved into the legend.   

Unfortunately, the engraved letters are not as defined as you would expect; the lettering is slightly jagged in appearance (enlarge above image). 

LEFT:  The detail of the annunciators is very good and the jagged appearance of the lettering only becomes apparent when they are backlit.  The backlight intensity is set to 100% (click to engage).

This is noticeable only when observed very close-up; from a normal distance (seated) this is barely noticeable and therefore, not really an issue.   However, the ability of the legend to transmit light evenly through the cut-out lettering is noticeable as the jagged appearance causes the names to appear slightly ‘furry’ (brighter or dimmer) depending upon the amount of light that can travel through the lettering, and your viewing position.

The annunciator legends and the checkerboard, are illuminated by strategically-placed LEDs.  

Window Bezels and Liquid Crystal Displays (LCDs)

The two main differences that separate an OEM MCP from a reproduction MCP are the design and appearance of the bezels that surround the display window, and how the actual characters (digits) are displayed.

SimWorld have used a black-coloured bezel that surrounds each of the display windows.  The bezel is identical to the bezels in the OEM MCP, and the join between the bezel and the display frame is seamless.

Equally, the use of custom-made Liquid Crystal Displays (LCDs), with each display backlit by one LED, is what causes SimWorld’s design to stand-out above its competition.  

The combined use of LCDs and LEDs enables each character (digit) to be displayed in the correct shape, colour and size.  This is in addition to displaying the specific characters used in the speed window (under and overspeed conditions) and the +- symbols displayed in the vertical speed window.

LEFT:  The checkerboard is identical in appearance across all annunciators.  Note the ambient sensor and + character in the vertical speed window.  Also the very slight difference in the illumination of the + sign  Backlightng is set ~50% intensity (click to enlarge).

Although appearing rudimentary, this is similar to how the OEM displays are illuminated.  To my knowledge, all other manufacturers of reproduction MCPs use seven-segmented displays.

While the use of this type of display is a positive step forward, it is not without its negatives; if the LEDS are incorrectly positioned, or the throw of light is not even across the rear of the LCD, then the characters will not be evenly lit.  This may cause some of the characters in a display to be brighter or dimmer (hot or cold spot).

To counter against this, quality assurance (QA) must be exceptionally thorough.  I will discuss QA later in this article.

LCD Brightness

As discussed earlier, each LCD is backlit by a single LED (this is how the characters (digits) are illuminated).

LEFT: Backlighting at full intensity is excellent (click to enlarge).

The brightness of the digits is linked to the intensity of the backlight dimming.  Therefore, as backlighting is dimmed, the brightness of the LEDs behind each LCD is lowered.   Although this is exactly how dimming operates in the real aircraft, I find that during the day in bright conditions, with the backlighting turned off, it’s difficult to read the digits as their intensity is not very bright.  At night and in low light conditions this is not an issue as the digits can easily be read. 

A solution to this issue is for SimWorld to enable an alternate method (although not as done in the real aircraft) to allow the brightness of the LEDs to be independent of backlighting.

Autothorttle (A/T)

The A/T toggle, controlled by a solenoid-release mechanism, resembles the OEM toggle.

The system logic SimWorld use in the toggle is slightly different to other reproduction MCPs, in that the toggle can only be engaged when certain conditions are met (system logic).

If the correct conditions are not met, then the toggle cannot be engaged; the toggle will not stay in the engaged position (up) but flick back to the disengaged position (down).  Be aware that for this functionality to operate, the avionics suite in use must also have this capability.

Electronic Flight Instrument System (EFIS)

Disregarding OEM panels, the SimWorld EFIS is probably the best on the market (at the time of writing).   Each EFIS replicates its OEM counterpart in both appearance and functionality, and is the correct size (1:1).

LEFT:  Captain-side EFIS panel with backlighting at full intensity.  The lightplate is well made and the laser engraving is well defined enabling even illumination of backlighting accross the panel.  The BARO STD knob has purposely been left slightly left of center.  When the BARO knob is released it will spring back to the central position (click to enlarge).

Two noticeable positives are the concave-designed push in/out function buttons on the lower portion of the unit, and the use of independent duel rotaries that are centrally spring-loaded.  

Quick ListMain Advantages (SimWorld EFIS):

(i)      Correct size and dimensions (1:1);
(ii)     Use of externally protected printed circuit boards (PCB);
(iii)    Correct Boeing-grey colour;
(iv)    Accurate aluminum knobs with set screws;
(v)     Independent backlighting between Captain-side and F/O side EFIS units;
(vi)    Two speed rotary encoders which auto-center (BARO and MINS);
(vii)   Well defined laser-cut lettering on light plate; and,
(viii)  Concave-designed push buttons.

Manufacture and Detail - EFIS

The EFIS has been manufactured and assembled in a similar way to the MCP.  The EFIS panels are 1:1, are the correct shaded grey colour, include the appropriate screws located in the correct location, and have the correct styled knobs.  As with the MCP, the EFIS use printed circuit boards which are then protected by an exterior aluminium casing.

LEFT:  First Officer side EFIS.  Knob length, functionality and detail are as per the real aircraft as is concave function buttons and well defined lettering and even backlighting accross the lightplate (click to enlarge).

EFIS Light Plate, Backlight Dimming and Exterior Casing

The laser-cut lettering on the light plate is crisp and sharp, and when the EFIS is backlit the light is evenly spread at the same intensity across the panel. 

Both EFIS panels are dimmed through the same dimmer interface card (DIC) used for the MCP, however, the F/O EFIS panel can be dimmed separately to the Captain-side panel (as it is done in the real aircraft).  

The protective casing that each EFIS resides measures 5 inches in depth perpendicular to the light plate.   On the rear of the unit is a female 5-volt DC power connector, and a connection for the plug that connects the EFIS to the CANBUS system.


The manufacture of the knobs is similar to the knobs used on the MCP, with the exception that a centrally-placed disc has been laser engraved to enable the function name to be backlit.  The lettering on the discs is crisp and sharp.  The knobs are held securely to the rotary shaft by two metal set-screws.  

LEFT:  First Officer side EFIS.  The lettering and black disc is well made.  The metal set screw that attaches the upper knob to the dual rotary can be observed.  The upper knob is self centering (click to enlarge).

The pointer (black & white line) on the function selector knob is a transfer that has been glued to the outside of the knob.  The adhesive has been solidly applied and I doubt the transfer will come loose.

Rotary Encoders

The rotary encoders are similar to those used in the MCP and have a metal cylindrical shaft.  Each of the encoders is a double encoder meaning that it has dual functionality.

Specialist Functionality - BARO and MINS

The barometric pressure (BARO) and radio altitude/pressure (minimums) function exactly as those in the real aircraft.  The outer knobs are spring-loaded, and when rotated and released, self-center with the label resetting to the horizontal position.  The knobs also are push to reset.

Each knob has two speeds: a slight turn left or right turn will alter the single digits, while holding the encoder left or right for a longer period of time will change the double digits, and cause the digits to change at a higher rate of speed.   

The below video, taken inside the flight deck of a B73-800 aircraft shows the operation of the OEM BARO and MINS (courtesy Shrike 200).  The SimWorld BARO and MINS knobs operate the same way.


Concave-shaped Function Buttons

The function buttons on the EFIS are concave in shape and made from plastic (this differs to the rubberized buttons seen on several OEM EFIS panels).  Each button has the name of the function engraved into the button.  The engraved letters are crisp and sharp and when the panel is backlit, the letters are evenly illuminated without hot or cold spots.  

Each button’s mechanism is made from plastic, and while the use of plastic is understandable, metal probably would increase the mechanism’s service life.  

Minor Problem - Sticky EFIS Button

A minor issue developed after installation of the EFIS into the bracket.  Two function buttons when pressed, would not automatically reset themselves (click in and click out).  The problem only presented when the panel was mounted into the bracket faceplate.

After carefully examining the bracket and protective casing, it was found that when the EFIS was mounted into the MIP, the casing was compressed against the button.  This caused the button to remain pushed in.

The problem was resolved by slightly bending the aluminum external casing so that it did not rub against the button’s mechanism. 


The functionality of the EFIS is identical to the OEM EFIS.

MCP and EFIS Bracket

SimWorld provide a sturdy bracket that is used to mount the MCP and EFIS panels to the Main Instrument Panel (MIP).

LEFT:  SimWorld propriety bracket to mount MCP and EFIS into the SimWorld MIP.  The bracket is solid and very well made (click to enlarge)

The bracket consists of a front faceplate and a rigid bracket framework.  Both items are made from 1 mm thick, black-coloured, powder coated aluminum.  The faceplate is precut to allow fitment of the MCP and EFIS.  The framework provides stability to stop the EFIS panels from wobbling in the precut hole.  

Mounting The Bracket To The MIP

The bracket is designed to be used with SimWorld’s propriety MIP, however, the bracket can be used with other MIPs.  Take note that, depending upon which MIP is used, the bracket/MIP may need to be modified.

I retrofitted the bracket to a Flight Deck Solutions (FDS) MIP which was not without its problems. 

Problems Retrofitting The Bracket to the FDS MIP

The FDS MIP, the distance between the Captain-side and F/O-side glarewings did not allow enough room to enable the bracket faceplate to be fitted; the bracket was approximately 1 mm too long, and the bracket framework was too deep to easily slide into the recess of the FDS MIP.

These shortcomings were rectified by shaving away a small portion of the inner side of each glarewing.  This enabled the bracket faceplate to fit snugly between the glarewings.  

To use the bracket framework (which is quite deep), the internal structure of the FDS MIP has to be cutaway, an act that may affect the structure of the MIP.  Therefore, the framework was discarded and only the bracket faceplate was used.  

Without the framework to provide stability, the EFIS panels wobbled somewhat in the bracket faceplate.  To stop the EFIS from wobbling, small wedges made from wood were fabricated and installed between the EFIS and the inside edge of each glarewing.  Once the wedges were installed, the EFIS did not wobble.  The MCP is secured to the bracket faceplate by four screws which inhibits any movement.

A facsimile of the piece of metal that covers the underneath portion of the MCP was made from thin metal, painted black, and the appropriate screws added.

Wiring Harness

SimWorld supply a high quality wiring lumen that consists of four colour-coded wires with connectors.  The wires connect to the MCP and EFIS, and then to a 5 and 12 Volt power supply, dimming interface card (DIC), and the CANBUS system.  The power connections are standard push pull plugs and the wires that connect the MCP and EFIS with CANBUS use wire tap connectors (T-taps).   The length of supplied wire approximately 12 feet and SimWorld provide a basic wiring diagram.

LEFT:  T-taps can damage wires causing connection issues, so should be viewed as a temporary set-up (click to enlarge)

Wire Connectors

The use of wire tap connectors (wire chomper), although very convenient, should probably be looked at only as an initial connection when testing the panels.  For a more permanent connection, soldering the wires is preferable.  Soldering will remove the possibility of any troublesome connection.  

Let me explain,  the act of pressing the wire into this slotted metal piece bludgeons the wire. The concept behind this is fine – it’s supposed to strip back the insulation on the wire to make contact with the wire itself. The problem is that there is no guarantee that you won’t accidentally catch some of the wire in this process and tear some of the individual wire strands.  Additionally, if the insulation is broken over a wire, there is a possibility of corrosion (oxidation) occurring.  

Push-Pull Power Plugs

Although the use of a push/pull power plug is standard to many appliances, the connection is not tight.  If pressure is applied to the power cable, it is easy for the plug to become dislodged and loose connection with the MCP or EFIS.  

LEFT:  Power plug and CANBUS connector.  Each panel is connected to CANBUS by one of these connectors, and then to the dimming interface card (click to enlarge)

On a simulator with motion control, vibration could cause the plug to be dislodged.  An easy matter to rectify, the security of this connection should be improved in future designs.

CANBUS Controller System

The CANBUS system (also called Simbox or CAN controller) enables communication between the server computer and the MCP (and specific SimWorld panels) and is a vital part of the SimWorld architecture.

CAN is an acronym for Controller Area Network and is a bus standard designed to allow micro controllers and devices to communicate with each other.  Simply put, CANBUS translates the CANBUS signal, allowing for control and communication through the computer.

The CAN controller system (printed circuit board) resides in a ribbed-aluminum case with two connectors at each end of the case; one side connects with the computer via a standard USB cable while the other side connects, via a specialist connection, to the wiring harness, and then to the MCP and EFIS panels.  The CAN controller does not require a dedicated power supply.

LEFT:  CANBUS module.  Made from aluminium and housing a Printed Circuit Board (PCB), the CAN controller is what connects the MCP and EFIS tot he server computer.  During all trials, CANBUS performed flawlessly with no drop outs, lags or failures (click to enlarge).

CANBUS is small and light enough that it can be mounted anywhere between the MIP and server computer.  I have the CANBUS unit secured to the rear of the MIP via a Velcro strap.

Connection and Drivers

CANBUS does not require any drivers to operate as it’s detected by ProSim-AR when the software is turned on.  Connection is immediate, and whatever configuration is needed is done automatically through Windows the first time CANBUS in connected to the computer.  

There should not be any connection or communication issues provided you have checked (ticked) the enable SimWorld drivers within the configuration/drivers tab of the ProSim737 software.  


At the time of writing, CANBUS is compatible with ProSim-AR (plug and fly).  A dedicated driver for iFly and PMDG is under development.  Prior to purchase, I would seek the advice of SimWorld to whether CANBUS is compatible with the avionics suite you are using.

Reliability of CANBUS

In one word - 'perfect'.   I have not had the MCP, EFIS or CANBUS disconnect during a flight simulator session.  This is using FSX and ProSim-AR (version 1.49).  As a test, I disconnected the CAN controller during a flight, then reconnected it.  The flight was not disrupted and the reconnection occurred effortlessly.

Robustness and Service Life

The life and serviceability of a product has a direct relationship to how the product is used (or abused) and the duration of use.   Modern electronics are very forgiving, and electronic problems (if any) usually develop soon after an item begins its service life.  If problems are not detected after first use, then it is not unusual for an item to have a considerable service life.

Some of the more common problems that occur with reproduction panels include; failing encoders, damaged plastic encoder shafts, worn out set screws, slippage of knobs, and faulty switches and buttons.  Additionally, knobs may wear out with use, and paint on the lightplate may chip.  

SimWorld have countered potential problems by using printed circuit boards, commercial metal encoders, aluminum knobs, metal set-screws, and by replicated, as much as possible the same processes used in the manufacture of OEM light plates.  

The above said, it's wise to remember that reproduction panels rarely replicate the robustness and exacting standards of an OEM product; therefore, they should be treated with respect and with care.   I expect that in time the paint on knobs will chip and wear thin with use - this is normal wear and tear.  I don't mind this 'wear and tear' look as it is very seldom you a knob that is shiny new - unless the aircraft is new.

Quality Assurance (QA), Customer Service, and My Experience

Put bluntly, when anything is done by hand there must be a very high level of Quality Assurance (QA) to ensure that design specifications and tolerances are met.  QA can be an expensive process as time is needed to inspect each individual panel and then, if imperfections are noted, make required alterations/repairs.

There is a direct relationship between the price that an items costs and the amount and level of QA that is performed.  You would not expect an inexpensive item mass-produced in China to have high QA – and it doesn’t, which is why many Chinese-produced products fail after a short period of time or have obvious defects.   However, if you are purchasing a high-end product with a high price tag then the expectation is that this product will meet specification, will not have problems, and be sold with an excellent warranty and support.

SimWorld realize that enthusiasts demand quality and strive to meet this requirement.  However, not everything passes muster first time around and sometimes products are released that are not quite up-to-standard.   Whenever this occurs the reputation of the company is tested.

To ensure transparency, I have documented the issues below not to provide negative criticism of SimWorld, but to highlight their dedicated customer support and strong company ethics.  

My Experience

The first MCP and EFIS sent to me from SimWorld did not meet my expectations and had several issues.  Namely:  

(i)     Uneven brightness of the characters (digits) across the five LCDs with some characters presenting as hot spots;
(ii)     Rotary encoders cross-referencing values;
(iii)    A/T arming toggle not locking into the arm position (UP position);
(iv)    Crooked LCD in the course display window; and,
(v)     The light plate on the EFIS was not mounted parallel to the backing plate (crooked).

I contacted SimWorld and they requested that I return the panels to Poland (at their expense) for repair.  

The problems experienced were caused by:

(i)     The positioning of the LED behind the LCD was slightly off center.  This was rectified;
(ii)    The rotary encoders were faulty and had been tracked to a bad batch released from the manufacturer.  They were replaced;  
(iii)   The autothrottle toggle was not aligned correctly with the magnetic plate mounted behind the light plate. This was fixed by moving the toggle very slightly to the left;
(iv)    The crooked LCD was straightened.  As the LCDs are mounted by hand, careful attention must be paid to ensuring they are straight; and,
(v)     The misalignment of the F/O EFIS panel was rectified by making it straight against the backing plate.  

Repaired MCP and EFIS

Unfortunately, following receipt of the repaired MCP, the Captain-side course display would not illuminate.

Piotr at SimWorld organized for my computer to be tethered to their technician’s laptop to enable bench testing.   Unfortunately, the technician could not determine what was causing the problem, but thought it may be a faulty capacitor.  

Rather than attempt to repair the MCP again, Filip arranged for a replacement MCP panel to be sent to me by UPS.  

Replacement MCP Panel

The replacement MCP, by chance, was the newer panel manufactured in 2017.  I have not had any problems with the replacement 2017 model MCP and EFIS.  Both panels function flawlessly and the attention to detail on the panels is beyond reproach.  

Warranty and After-Sales Service

The MCP and EFIS is covered by 12-month unconditional warranty.

The after-sales service and warranty cannot be bettered, and I cannot stress the advantages of dealing with a company that treats its customers with respect and places customer service as a priority.  

In relation to the issues I had with the MCP and EFIS, SimWorld responded to my e-mails within 24 hours, followed up on my questions, provided reasons for the problem, and kept me updated with regard to repairs and/or replacement.   The after-sales service and support provided to me has been exemplary.  

Negatives - MCP and EFIS

It’s difficult to find any major negatives.  However, if pressed they are:

(i)    During the day, the digits displayed in the LCDs are difficult to read if the backlighting is dimmed 100%;
(ii)    The power connection on the rear of the MCP and EFIS is not secure.  If any pressure is applied to a cable, then it’s very easy for the connector to become dislodged from the panel;
(iii)    The laser cutting on the annunciator legends (Speed, V/S, RNAV, etc.) could be more precise (this really is not an issue unless you inspect your panel with a macro lens); and,
(iv)    The non-use of D-shaped shafts on the rotary encoders.  If used, this would minimise the chance of any knob slipping on the shaft of an encoder.
(v)   The brightness of the digits displayed in the LCD's, although more or less even accross all characters, does show slight intensity differences.  This is caused by the positioning of the LED that sits behind each LCD. 

Pictures and Videos

I have not included many photographs in an attempt to keep the footprint of the article to a reasonable size. 

Several images can be viewed in the image gallery - SimWorld MCP Version 2.  I have posted several 'very average' photographs in this gallery in an attempt to show you the appearance of the panels.  Promotional images and videos are fine, but they are always professionally made to show the product in its best light.  You will also see a few images of OEM panels in the gallery to compare.

Below are three professionally made videos courtesy of SimWorld.

The panels displayed in the video accurately reflect the appearance, detail and functionality of the MCP and EFIS.  Equally, CANBUS is as straightforwrd to connect as shown in the video.


A quick word about photography.  Detailed and close-up photographs will always show unwanted blemishes.  The better the lens the more blemishes will become obvious.  It's important to remember that you do not fly the simulator looking through a magnifying loop, but view panels from a moderate distance.  Even OEM panels show inconsistencies when viewed with a macro lens :)


This article has taken several months to complete.  Originally it was three times the length and it's taken some time to condense the information to a length that is readable without it being bound in a book!

Final Call

The price paid to own the SimWorld MCP and EFIS is not inexpensive, however, it is nowhere near the price demanded of a OEM Collins panel, or a panel used in a commercial simulator trainer.

SimWorld's use of liquid crystal displays in lieu of seven-segmented displays, the resistance felt when turning the various knobs that closely match the OEM panels, and the close attention paid to detail: for example, the small tabs beside the Flight Director switches, detailed display bezels, ambient sensor, and realistic push to reset barometer and minimums knobs, is what separates this MCP and EFIS from its competition. 

If you want the appearance of the MCP and EFIS to be as close as possible to the OEM equivalent, and want accurate functionality, then you should not discount the panels produced by SimWorld.