What is the procedure if a hung start occurs when starting a turbojet engine?

• A. Terminate the starting operation and find the reason the engine would not accelerate as it should.
• B. Keep cranking until it starts on its own.
• C. Increase fuel flow and try again.
• D. Ignore and continue starting; it will catch.

Answer: (A)

A hung start happens when the engine lights off but cannot accelerate to a speed that would become self-sustaining, so it sits at an intermediate RPM with fuel continuing to be supplied. This is unsafe because forcing the start to continue can lead to engine damage from overheating, compressor stalls, or fuel flooding if it finally catches. The proper action is to terminate the starting operation, secure fuel and ignition, and stop the starter, then investigate the reason the engine would not accelerate as it should—possible issues include fuel control/fueling faults, ignition problems, or air/duct restrictions. Once the root cause is identified and corrected, you can reattempt the start with the appropriate procedures.