Author Topic: XFMC  (Read 1373 times)

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Offline Adrian Chitan

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XFMC
« on: February 27, 2015, 10:27:00 PM »
Hi guys,



just wanted to let you know about a tool that introduces FMC/MCDU to any airplane in X-Plane. It is called XFMC and it simulates the functionality of a Boeing FMC or an Airbus MCDU (setting a flag differently in the cfg file). This is not a new tool but only now I think it has reached the maturity it needed before taking it into consideration. The good thing about this last version is that it was included in the default NAVIGRAPH update list so you can automatically import a new AIRAC in it and take advantage of fixes, SIDs and STARs.

In the image above you can see me using the tool with the B-732Adv which had no FMC but it used the older INS-only system. It has an AP mode which kind of overrides the airplane's MCP, but not quite...

It has the usual three AP channels: LNAV, VNAV and ATHR.
LNAV is lateral navigation so it guides you through the fixes on the FP. It does this by setting the normal AP of the plane you're flying to Heading Select and automatically setting new headings for the next fix on the FP.
VNAV, vertical navigation, is done by following the constraints and calculated altitudes of the fixes in the FP (all of which are customizable by the pilot). It does this by putting the AP of the plane in V/S mode and automatically inserting new descent/climb vertical speeds to reach the set altitudes considering the actual speed of the plane.
And finally, ATHR inserts speeds into the AP SPD mode of the AP and manages engine power to maintain those speeds. On airplanes without "natural" auto-throttle, the ATHR mode only inserts speeds into the speed bug.

These are very ingenious ways of solving the missing FMC problem. But XFMC's features don't stop here and it actually has almost all (what I've seen missing is the FIX page and the ENG OUT page - it would be difficult to know the one engine thrust of every plane out there) the functionality that a PMDG Boeing FMC has, including holding pattern manipulation and prediction page or progress pages. It just does things differently to accommodate a more general approach into FMC functionality.

Happy flying!
« Last Edit: February 28, 2015, 07:39:21 AM by Adrian Chitan »

Offline Bogdan Ghincea

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Re: XFMC
« Reply #1 on: February 28, 2015, 12:49:11 AM »
I've heard about it. There is something similar for FSX but not that good. Handy tool anyway for implementing AIRAC in any airplane.

Offline Adrian Chitan

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Re: XFMC
« Reply #2 on: February 28, 2015, 09:31:25 AM »
Oh, and the INIT REF page doesn't show the normal APP page after going through the Cruise mode as it should normally do. But that has no meaning in the large plethora of aircrafts that it can be applied to (all of them!). You have to take care of the VAPP by yourself.

Also the RTE DATA page shows no weather data but only fuel prediction. Again it would have no sense of bringing weather data into a plane which has no weather sensors. On the other hand, the second PROGress page shows wind components and temperature readings even if the plane is just a C172 being plugged into the global X-Plane information bus.

Cheers :D

 

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