Final answer:
When all normal AC power is lost in an aircraft, the Auxiliary Driven Generator (ADG) powers the emergency hydraulic pump, ensuring continued functionality of critical systems like flight controls and landing gear.
Step-by-step explanation:
The subject in question relates to the operation of hydraulic systems in aircraft, where an Auxiliary Driven Generator (ADG) can be a critical component. In situations where an aircraft loses all normal Alternating Current (AC) power, the ADG is designed to deploy automatically and provide emergency power. The specific hydraulic pump powered by the ADG in such a scenario is typically the emergency hydraulic pump.
This emergency hydraulic pump is essential for maintaining the functionality of critical systems such as flight controls and landing gear deployment. In hydraulic systems in vehicles like power brakes in cars or those used in heavy machinery such as bulldozers, a motorized pump plays a similar key role by powering the hydraulic system to ensure continuous operation.