ADX Vehicle Systems and Operations 2 — Questions and Answers
Question 1: What is the primary purpose of an aircraft's hydraulic system?
- To cool the engines during operation
- To power flight control surfaces, landing gear, and brakes (Correct answer)
- To provide cabin pressurization
- To supply fuel to the engines
Correct answer: To power flight control surfaces, landing gear, and brakes
Hydraulic systems power critical aircraft systems including flight controls, landing gear actuation, and braking.
Question 2: Which component converts mechanical energy into electrical energy on most large transport aircraft?
- Transformer rectifier unit
- Integrated drive generator (IDG) (Correct answer)
- Battery charger
- Inverter
Correct answer: Integrated drive generator (IDG)
Integrated drive generators (IDGs) are engine-driven generators that produce AC electrical power for transport category aircraft.
Question 3: What does the term 'MEL' stand for in aircraft operations?
- Maximum Engine Load
- Minimum Equipment List (Correct answer)
- Mandatory Engine Limitation
- Multi-Engine Logbook
Correct answer: Minimum Equipment List
The Minimum Equipment List (MEL) specifies which inoperative systems or components still allow dispatch of the aircraft.
Question 4: When is an aircraft's auxiliary power unit (APU) typically used?
- Only during emergency landings
- To provide ground power and bleed air when engines are not running (Correct answer)
- To boost engine thrust on takeoff
- To operate the weather radar system exclusively
Correct 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.
Question 5: What is the function of a thrust reverser on a jet aircraft?
- Redirect engine thrust forward to assist in deceleration after landing (Correct answer)
- Increase engine thrust for takeoff performance
- Cool exhaust gases before they exit the nozzle
- Reduce engine noise during approach
Correct 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.
Question 6: Which pneumatic system source is used to pressurize the aircraft cabin on most modern jet transports?
- Ram air scoops in the fuselage
- Engine bleed air from the compressor stages (Correct answer)
- A dedicated pressurization engine
- Ground support equipment only
Correct 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.
Question 7: What does a 'red arc' on an aircraft engine instrument indicate?
- Normal operating range
- Caution range requiring attention
- Never-exceed or never-operate range (Correct answer)
- Takeoff power setting
Correct 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.
ADX Vehicle Systems and Operations 2
What is the primary purpose of an aircraft's hydraulic system?