Capn boggs said
Scenario: cold ship, APU is started (or external power applied), as soon as power comes on-line, all 6 GCUs will be powered. 248 days later, all 6 GCUs will die.
Capn may have a valid point !!
IMO, since the APU is usually shut down in mid flight, it may be unlikely that the APU 2 GENS will have the same time count.
Meanwhile since each engine has 2 GENS, then those 2 GENS will usually have the same time powered. And since both engines are often started within minutes of each other, then it is quite likely that 4 GENS could be bricked by a counter within minutes of each other.
BUT what is unclear is IF the GEN COUNTER TIME counts SYSTEM powered time such as when under Ground Power- then even though APU is off, the 2 APU GENS may also be counted as ' powered " time.
One would certainly hope that Boeing would by now have clarified just how ' powered' time is counted by each GEN.
