AMP - Aviation Maintenance Technician Powerplant Practice Exam

In turbine engine operations, a hung start occurs when the engine does not achieve the necessary speed to reach stable operation after ignition has been initiated. Specifically, during a hung start scenario, the engine may ignite, but fails to accelerate to the idle RPM, indicating that it is not developing the expected performance.

The condition where the exhaust gas temperature exceeds specified limits is indicative of abnormal behavior, but it is not a defining characteristic of a hung start. Instead, it reflects potential issues such as an engine overtemperature condition due to insufficient airflow or an excessively rich fuel mixture.

The correct indication of a hung start is actually when the engine fails to reach idle RPM after starting attempts. This situation suggests that while ignition may occur, the engine lacks sufficient power or thrust to continue accelerating, leading to a failure to transition to the normal operating range. Awareness of this condition is crucial for maintenance and troubleshooting procedures following a start attempt.

Understanding these operational limits and the indications of engine behavior during start is paramount for aviation maintenance technicians, as it aids in diagnosing potential engine issues before they escalate into more significant problems.