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Flight Engineer Question Bank - Aircraft Regulations - Q589
On airplanes requiring a third gyroscopic bank-and-pitch indicator, which is a requirement with regard to the instrument or system's operation?
A. The power source must provide reliable operation for the duration of the flight after failure of the alternating current electrical system.
B. The power source must be manually selected to prevent an inadvertent failure during an automatic power transfer.
C. The power source must provide reliable operation for 30 minutes after total failure of the electrical generating system.

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