Question id 512 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Has 1/12 less voltage, but can still be used
Is unserviceable
Has 1/12 less voltage and less capacity, but can still be used
Has 1/12 less capacity, but can still be used

Training tests and timed exam simulations ATPL - Airline Transport Pilot license