Hi Toby320,
Edit.
All our aircraft have that limitation. FL335 ISA + 30 is just about where the maximum APU 100% available generator output starts to fall off.
I can only guess that the regulations specify that, at dispatch, we must plan a FL where 100% APU generator is available (in case the remaining main engine geny failed).
Last edited by rudderrudderrat; 8th Oct 2010 at 11:51.
Reason: re-read MEL