clem

Just a quick question for anyone who can answer. I'm a corporate guy and was deadheading EINN to KEWR. Captain announced the APU was not available for ground power/air. Naturally I gathered it was being MEL'd. Current airplane I am on will not allow the APU to be MEL's for extended range ops. Wondering if this is allowed on the 757. Thanks

80ktsClamp

The ETOPS 757s have a hydraulic motor generator which apparently CO uses that to allow the APU to be deferred for an ETOPS flight.

It varies between some carriers whether or not the APU can be deferred prior to an ocean crossing.

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Cycle Pilot

Delta's APU can be deferred and the aircraft restricted to 120 ETOPS, assuming the HMG works normally. I know this from experience!

clem

Thanks for the info. On the Gulfstream we also have an HMG but still does not allow for the APU to be MEL'd

sailingfun

Delta however prohibits dispatch form the US outbound with the APU inop. The MEL allows operations in either direction however Delta is more restrictive. Almost all other airlines allow dispatch both ways without a APU.

Phantom Flyer

Not to be trite, but it really depends on each carrier's MEL. If an HMG is installed, one carrier may allow dispatch for ETOPS, another may not and a third may allow dispatch from Europe but not a U.S. station with maintenance available. It all depends on the carrier's FAA approved MEL.

Personally, I want the APU to be operational for an ETOPS departure but that's just me.

G'Luck Mates

rickair7777

I think most or all non-ETOPS operations can go with a deferred APU, ie all domestic flying.