When the NGS PRSOV is closed, the system is OFF. The NGS PRSOV is
closed if any one of these conditions exist:
发布于 2021-03-20 06:24:55
【单选题】 A Airplane on the ground and not in test mode
；Either engine is OFF in flight B Fire or smoke detection in cargo or main deck areas；Left air conditioning pack overheat C The center tank refuelling valve is open D a+b+c
