I think it was a lawyer thing to protect Boeing if I remember. While in class someone asked why not to start APU after a dual gen failure. Instructor made a call and said that he was told an APU crank could deplete the rest of the batt so not to. That led to him saying that is BS just fly w the APU on all the time. Heck even the CRJ had an ADG (little air driven turbine would pop out).
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