On our 737 Classics the APU is usually quite weak (
), AND often the ground airconditioning they plug in is weak as well.
Now that it's quite hot, why wouldn't we use the two together?
I can't find any limitation...
Only the Supp procedure says Pack switch OFF to allow cart to operate at maximum efficiency, but actually I find the cooling much better using the two together.
Somebody said it's not allowed, but I think differently....