FAA Powerplant Written Practice Test

How are cylinders typically attached to the crankcase in an aircraft engine?

1. By welding

2. By bolts and nuts

3. By studs mounted in threaded holes

4. By clamps around the cylinder

The correct answer is: By studs mounted in threaded holes

Cylinders are typically attached to the crankcase in an aircraft engine using studs that are mounted in threaded holes. This method provides a secure and reliable connection, which is essential for maintaining the structural integrity of the engine during operation. The use of studs allows for a more even distribution of clamping force when the nuts are tightened, which helps to prevent issues such as warping or distortion of the cylinder heads. Additionally, this design allows for easier assembly and disassembly, enabling maintenance and repairs to be conducted efficiently. This attachment method is favored in aviation applications due to the high levels of stress and vibration encountered in flight, necessitating robust fastening techniques that can tolerate these conditions. The other attachment methods generally do not offer the same combination of strength, reliability, and ease of maintenance required in aircraft engines.