General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What is the power source for the alternate gear extension?

Pneumatic pressure system only
DC electric hydraulic pump and C hydraulic fluid
AC electric hydraulic system
Battery power alone

The correct answer is: DC electric hydraulic pump and C hydraulic fluid

The alternate gear extension system typically relies on a DC electric hydraulic pump in conjunction with the hydraulic fluid specified in the system. This design allows for effective and reliable operation of the landing gear when the primary extension system fails or is unavailable. The use of a DC electric hydraulic pump provides an independent and robust means of actuating the landing gear, ensuring that pilots have a backup method to deploy the gear when necessary. The hydraulic fluid plays a crucial role in transmitting the force generated by the pump to the landing gear's extension mechanism. This combination of electric and hydraulic systems allows for greater flexibility and reliability compared to alternatives that rely solely on pneumatic pressure or battery power. It also ensures that the system can function even when certain power sources may be compromised.