I'm enroute KOAK - PANC and decided to test something that I dont think is in the PMDG docs. If any of the FADECS switch to ALTN on the P&W equiped Aircraft we lose all A/T however the G&E aircraft will still provide A/T in a degraded mode. This is Simulated with the PMDG aircraft, can anyone explain why the P&W aircraft lose A/T and also what is degraded on the G/E powered Jets.ThanksRob

No idea. I just checked the manual, and can't find any reference to that logic.Paul

I'm enroute KOAK - PANC and decided to test something that I dont think is in the PMDG docs. If any of the FADECS switch to ALTN on the P&W equiped Aircraft we lose all A/T however the G&E aircraft will still provide A/T in a degraded mode. This is Simulated with the PMDG aircraft, can anyone explain why the P&W aircraft lose A/T and also what is degraded on the G/E powered Jets.ThanksRob

References:FCOM AP 40.5QRH AP 40.5SYS ENG 30.3Additional from another (outside PMDG) source for GE engines:Overboost protection no longer available.Think this goes for P&W engines as well.Regards,Harry

References:FCOM AP 40.5QRH AP 40.5SYS ENG 30.3Additional from another (outside PMDG) source for GE engines:Overboost protection no longer available.Think this goes for P&W engines as well.Regards,Harry

Thanks Harry, I thought I read it at SMARTCOCKPIT, but maybe it was from the docs. I'm just curious as to why P&W would have such a major disadvantage over G&E in such a competitive market? only one FADEC going to ALTN causes a total lost of A/T Rob

Thanks Harry, I thought I read it at SMARTCOCKPIT, but maybe it was from the docs. I'm just curious as to why P&W would have such a major disadvantage over G&E in such a competitive market? only one FADEC going to ALTN causes a total lost of A/T Rob

Maybe they are competing with one of the engine models having just 500lbs more TO thrust compared to the GE engine. I'm not a market analist but used GE's on the MD11 for real.Regards,Harry