FAA Powerplant Written Practice Test

What is the purpose of engine mounts on a turbofan engine?

1. Support the weight of the engine

2. Isolate the aircraft structure from adverse engine vibrations

3. Increase the engine's efficiency

4. Connect the engine to the flight control system

The correct answer is: Isolate the aircraft structure from adverse engine vibrations

The purpose of engine mounts on a turbofan engine is primarily to isolate the aircraft structure from adverse engine vibrations. Engine mounts are designed to absorb and dampen vibrations that occur during engine operation. These vibrations can originate from multiple sources, including combustion processes, moving parts, and airflow disturbances. By effectively isolating these vibrations, engine mounts help to ensure that the structural integrity of the aircraft is maintained and that passenger comfort is preserved throughout the flight. While engine mounts do support the weight of the engine, this function is secondary to their primary role of vibration isolation. Additionally, engine mounts do not actively contribute to increasing the engine's efficiency or connecting the engine to the flight control system. Their design is a critical factor in the overall performance and longevity of both the engine and the airframe.