The aircraft is on the ground and the Flight Recorder Switch is in NORMAL:
A.A.The Flight Recorder operates anytime electrical power is available
B.B.The Flight Recorder operates when electrical power is available and either engine is operating
C.C.The Flight Recorder operates whenever the Battery Switch is ON
D.D.The Flight Recorder operates anytime electrical power is available and start switch in GROUND position
正确答案是B