What is the proper starting sequence for a turbojet engine?

What is the proper starting sequence for a turbojet engine?

• A. Ignition, starter, fuel
• B. Starter, Ignition, fuel
• C. Starter, fuel, ignition
• D. Fuel, ignition, starter

Answer: (B)

Starting a turbojet requires turning the engine over with the starter to build compressor airflow and shaft speed. Once the engine is turning and the air supply is sufficient, the ignition system is activated so that when fuel is introduced it can ignite reliably. Fuel is then supplied to sustain combustion and accelerate the spool toward stable idle. If ignition is used without rotation, or fuel is introduced without ignition, combustion won’t start reliably, leading to a hard start or compressor stall.

Starting a turbojet requires turning the engine over with the starter to build compressor airflow and shaft speed. Once the engine is turning and the air supply is sufficient, the ignition system is activated so that when fuel is introduced it can ignite reliably. Fuel is then supplied to sustain combustion and accelerate the spool toward stable idle. If ignition is used without rotation, or fuel is introduced without ignition, combustion won’t start reliably, leading to a hard start or compressor stall.