Final answer:
In the event of a hung start during turbojet engine startup, the start process should be immediately aborted, fuel supply shut off and starter system disengaged.
Step-by-step explanation:
When a hung start occurs while starting a turbojet engine, certain procedures must be followed to address this condition safely. A hung start happens when the engine starts but does not reach idle speed as expected during the startup sequence. This can be a result of insufficient air flow, fuel flow issues, or a mechanical problem.
The correct procedure for a hung start typically involves aborting the start process immediately to prevent engine damage. This includes shutting off the fuel supply to stop the combustion process and disengaging the starter system to prevent it from overheating or getting damaged. It is essential to follow the specific guidelines provided in the aircraft's flight manual since procedures can vary depending on the engine model and aircraft type.
After safely shutting down the engine, it is necessary to determine the cause of the hung start. This might involve inspecting the engine and its components, reviewing the start procedure to ensure all steps were followed correctly, and possibly consulting maintenance personnel. Once the cause is identified and corrected, the engine can then be cautiously restarted following proper procedures.