Which items become inoperative with a GEN BUS failure?

With a generator bus failure, the systems that rely on electrical power supplied through that bus will become inoperative. Flaps and gear controls are critical systems that require electrical power to function properly. When there is a failure in the generator bus, these hydraulic systems may not receive the necessary electrical signals for operation, leading to a total loss of control over flaps and landing gear.

Conversely, while other items such as electrical avionics systems, internal communications systems, and transponders may depend on electrical power, they may be operating on a different bus or backup systems that can be activated. Therefore, flaps and gear controls specifically rely on the functioning of the generator bus, leading to their inoperability during a GEN BUS failure. Understanding this relationship is crucial for emergency procedures and system management during flight operations.