A320 Generator MEL
I seem to recall that it has something to do with the APU generator. The APU generator is required to run throughout the flight and I am pretty certain that above FL335 there is a risk of 'arching' in the APU GEN. That may not be correct as I am reaching way back in the old brain to come up with that.
Join Date: Feb 2013
Location: The Wood
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The limitation is to ensure that you have 100% of the APU output available. If you go to FCOM LIM 49-20 P1/4 at the bottom of the page there is a table containing generator loads in flight for different levels. There you will see at ISA and 35000 Feet you only have 93% or 84 KVA available.