What action should be taken if a hung start occurs on a turbojet engine?

• A. Continue attempts until it accelerates.
• B. Terminate the starting operation and determine why acceleration is not occurring as expected.
• C. Increase throttle and retry.
• D. Abort the start and perform a full engine diagnostic.

Answer: (B)

A hung start happens when the engine does not accelerate to a self-sustaining speed after ignition. The best action is to terminate the starting operation and determine why acceleration isn’t occurring. Stopping the start prevents further fuel flow and starter energy from being wasted and protects the engine from damage that can happen if you force a start. It also lets you collect data and inspect the likely fault sources, such as the ignition system, fuel control/fuel flow, and the starter, to identify why the engine isn’t spooling up.

Continuing to crank or increasing throttle during a hung start can aggravate issues, potentially causing compressor surge, overheating, or fuel-related damage. While a full diagnostic may be required after you secure the engine, the immediate priority is to stop the start and diagnose the cause of the lack of acceleration before attempting another start.