Aircraft Maintenance Engine & System Repairs 1 — Questions and Answers
Question 1: What is the primary function of an aircraft engine oil system?
- To provide fuel to the engine
- To lubricate engine components and dissipate heat (Correct answer)
- To generate electrical power
- To control flight surfaces
Correct answer: To lubricate engine components and dissipate heat
The primary function of an aircraft engine oil system is to lubricate moving parts, reducing friction and wear, which is crucial for the engine's longevity and efficient operation. Additionally, the oil system plays a significant role in dissipating heat generated during combustion and friction, helping to maintain optimal engine operating temperatures.
Question 2: Which tool is commonly used to check cylinder compression in an aircraft engine?
- Torque wrench
- Compression tester (Correct answer)
- Micrometer
- Tachometer
Correct answer: Compression tester
A compression tester is a specialized tool used to measure the compression pressure within an aircraft engine's cylinders. This test helps diagnose issues such as worn piston rings, faulty valves, or cylinder head gasket leaks, which can significantly affect engine performance, efficiency, and overall health.
Question 3: What is a common cause of an aircraft engine overheating?
- Excessive fuel pressure
- Low oil levels (Correct answer)
- Incorrect tire pressure
- Malfunctioning landing gear
Correct answer: Low oil levels
Low oil levels in an aircraft engine are a common and critical cause of overheating. Engine oil not only lubricates components but also plays a vital role in cooling by carrying away heat generated during operation. Insufficient oil can lead to increased friction, reduced heat dissipation, and ultimately, engine overheating and potential damage.
Question 4: Which component regulates fuel flow to the engine in a fuel injection system?
- Fuel control unit (Correct answer)
- Throttle cable
- Alternator
- Oil pressure sensor
Correct answer: Fuel control unit
In an aircraft engine's fuel injection system, the fuel control unit (FCU) is responsible for precisely regulating the amount of fuel delivered to the engine. It adjusts fuel flow based on various engine parameters like throttle position, RPM, and air density, ensuring optimal combustion, efficient performance, and proper engine operation across different flight conditions.
Question 5: What is the function of an aircraft's hydraulic system?
- To supply oxygen to passengers
- To control landing gear, brakes, and flight surfaces (Correct answer)
- To generate thrust for takeoff
- To regulate cabin temperature
Correct answer: To control landing gear, brakes, and flight surfaces
An aircraft's hydraulic system uses pressurized fluid to transmit force and motion throughout the aircraft. This power is crucial for operating heavy components such as the landing gear, applying braking force, and moving primary flight control surfaces like ailerons, elevators, and rudders. These functions require significant force to overcome aerodynamic loads and ensure safe operation.
Question 6: What is the purpose of a magneto in an aircraft engine?
- To measure airspeed
- To generate electrical power for the ignition system (Correct answer)
- To control hydraulic pressure
- To provide navigation signals
Correct answer: To generate electrical power for the ignition system
A magneto is a self-contained electrical generator specifically designed to produce high-voltage electricity for the spark plugs in an aircraft's piston engine. Unlike a car's ignition system, magnetos operate independently of the aircraft's main electrical system. This provides a reliable and redundant source of ignition power, which is critical for engine starting and continuous operation.
Aircraft Maintenance Engine & System Repairs 1
What is the primary function of an aircraft engine oil system?