FAA Powerplant Written Practice Test

When mounting a replacement engine, what is crucial to ensure?

1. Use any available bolts for convenience

2. Install the manufacturer-specified bolts and torque to recommended values

3. Use the original engine's bolts

4. Follow a general torque standard

The correct answer is: Install the manufacturer-specified bolts and torque to recommended values

When mounting a replacement engine, it is crucial to install the manufacturer-specified bolts and torque them to the recommended values because this ensures the integrity and safety of the engine installation. Each engine design has specific requirements for fasteners, which are selected based on material, strength, and load-bearing capacity, ensuring that the engine will be securely mounted and able to perform optimally under its operating conditions. Using the manufacturer-specified bolts ensures compatibility and reliability, as they are designed to fit precisely and meet the performance standards required for that specific engine model. Furthermore, adhering to the recommended torque values is essential, as inadequate or excessive torque can lead to failure under operational stresses, potential engine damage, or unsafe conditions during flight. Properly tightened bolts help maintain the alignment of engine components, reduce the risk of vibration-related issues, and prevent leaks or failures that could arise from insufficient clamping force. Overall, following the manufacturer's specifications is a fundamental safety practice in aviation maintenance that helps ensure long-term reliability and safety of the powerplant system.