Hi can anyone advise, When I set my aircraft up pre-flight as soon as a disconnect Ground services  I get the FMC message L GPS R GPS Invalid

and the warning bleeper sounds  a  GPS light above the IRIS selectors is illuminated and the D/C light fails to extinguish

I have programmed the FMC POS as per PMDG documentation and gate number is inserted and the aircraft has remained static at the same airport.

 

I'm using Windows 7 64Gbts Ultimate

FSX with accelerator

 

                                                   Many Thanks

                                                      Richard

Have you moved the IRS switches to the NAV position to align them?

 

They are in the upper overhead panel on the left-hand side.

It sounds like you're disconnecting ground power without anything to replace it. Start the APU, and make sure you select the APU buses to on. I've been caught by that myself more times than I care to admit, I start the APU, never connect the buses, have my FS2Crew F/O do the before start procedure in which he removes the chocks (which removes ground power) and suddenly I have no power...  :blush:

Yes IRS are set correctly and at times D/C lights extinguish and Aligns illuminate then extinguish, all appears normal I complete all my other set-ups then as Groundpower is disconnected  The LGPS R GPS FMC prompts appear and the warning bleeper goes off

really wondering what i'm forgetting to do, have followed the documentation and view dark n' cold set-ups on You Tube but all seems as others do.

 

Anyway thank you for the reply

           Richard

Thanks Steven

That's a great pointer, I always have the APU fired up prior to disconnect but maybe amnesia when it comes to the APU buses i'll look at that and see if i've neglected that, were you getting the same FMC messages as me ?

Once even had the plane lose power taxiing then the same FMC message and engine shutdown.

 

Thanks Steven

   Richard