Hello PMDG,Like the real A/C, sometimes it happends that the APU won't start and they need ground source to start the first engine and then use the BLEED AIR from that engine to start the second one.But how can I get the Ground Air Source so I can do that???Thanks,

These things aren't modelled, me thinks.Nor is there in FS9 itself an option for external Ground Air Source.Btw. PMDGs APU will usually start always ;-)

no, not always.And PIC did modelated it.

That's right! PIC had ground source modeled.

I have to say that I am suprised that PMDG did not model this function. both 767PIC and A320 pic had this feature. It is definately not impossible to implement in fs. However, the PMDG team may have a reason for not having this feature. maybe it might have something to do with NG specifics?