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

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What is required to manually deploy the RAT?

APU battery only
Hot battery bus or APU battery bus
Complete electrical systems
Ground power unit

The correct answer is: Hot battery bus or APU battery bus

The correct answer is related to the system requirements for the manual deployment of the Ram Air Turbine (RAT). The manual deployment of the RAT is designed to ensure that the aircraft can generate hydraulic and electrical power during an emergency situation when the main systems are not operational. Using the hot battery bus or APU battery bus allows the RAT to deploy without relying on the complete electrical systems of the aircraft. These buses are independent power sources that can provide the necessary voltage to activate the mechanism for deploying the RAT, ensuring functionality even in the event of a major system failure. This capability is crucial for maintaining control and essential systems in emergencies since it enables control of the aircraft’s backup systems despite potential failures in the main electrical and hydraulic systems. The other options, like requiring the complete electrical systems or a ground power unit, would not be applicable in an emergency scenario, as these systems may not be available or functional.