Vehicle Systems and Operations Flashcards

What is the primary purpose of an aircraft's hydraulic system?

Answer: To power flight control surfaces, landing gear, and brakes

Hydraulic systems power critical aircraft systems including flight controls, landing gear actuation, and braking.

Which component converts mechanical energy into electrical energy on most large transport aircraft?

Answer: Integrated drive generator (IDG)

Integrated drive generators (IDGs) are engine-driven generators that produce AC electrical power for transport category aircraft.

What does the term 'MEL' stand for in aircraft operations?

Answer: Minimum Equipment List

The Minimum Equipment List (MEL) specifies which inoperative systems or components still allow dispatch of the aircraft.

When is an aircraft's auxiliary power unit (APU) typically used?

Answer: To provide ground power and bleed air when engines are not running

The APU provides electrical power and pneumatic bleed air for air conditioning and engine starting when main engines are shut down.

What is the function of a thrust reverser on a jet aircraft?

Answer: Redirect engine thrust forward to assist in deceleration after landing

Thrust reversers redirect exhaust thrust forward to help slow the aircraft after touchdown, reducing brake wear and stopping distance.

Which pneumatic system source is used to pressurize the aircraft cabin on most modern jet transports?

Answer: Engine bleed air from the compressor stages

Hot, high-pressure bleed air is extracted from the engine compressor and conditioned by the air cycle machine to pressurize and cool the cabin.

What does a 'red arc' on an aircraft engine instrument indicate?

Answer: Never-exceed or never-operate range

Red arcs on engine instruments mark the never-exceed or never-operate range; operating in these ranges can cause engine damage or failure.