1. Radial engines are susceptible to a condition called hydraulic lock. Examine the major components of a radial engine and define hydraulic lock. Explain how you would check for hydraulic lock during a preflight. If during the preflight you discover the presence of hydraulic lock, explain how you will correct the situation. What design elements are incorporated in the cylinders to help prevent hydraulic lock?
2. An owner of a single engine airplane with a Lycoming engine has a problem with the engine running rough at idle. You are the maintainer and must troubleshoot. The owner explains:
“The engine has been operating properly for the past 50 hours. When the engine was started for a flight, it started running rough at idle.”
For this assignment, explain how to begin the troubleshooting process and identify the engine instruments you will use to determine the cause of the problem.
3. You have installed an overhauled carburetor on an aircraft’s engine. Explain how to set the idle RPM (revolutions per minute) and idle mixture. Identify the process, materials, and safety precautions necessary to accomplish this task.
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