FAA Powerplant Written Practice Test

What must be checked after replacing the spark plugs in an aircraft engine?

1. Friction levels

2. Clearance specifications

3. Voltage output

4. Torque settings

The correct answer is: Torque settings

After replacing the spark plugs in an aircraft engine, the torque settings must be checked to ensure that the spark plugs are installed correctly. Each spark plug has specific torque requirements that are critical for proper sealing and optimal performance within the engine. Ensuring that the spark plugs are tightened to the manufacturer’s specifications prevents issues such as leaks, misfires, or damage to the threads. Correct torque settings help maintain the integrity of the engine components and support accurate heat transfer from the spark plug to the engine, which is essential for effective combustion. Properly torqued spark plugs also facilitate easier removal during future maintenance. Maintaining these standards is vital for the overall safety and efficiency of the aircraft engine operation.