Discussion
Arrange the events of a normal engine light-up in order:
1. The starter accelerates the shaft and airflow is established
2. Fuel is admitted at the light-up speed
3. The igniters fire and light the burners nearest them
4. Flame spreads to the remaining burners in light-around
5. Exhaust temperature rises and the engine accelerates to idle
Select the correct sequence.
Answer: D
Only two igniters are usually fitted, so light-around through interconnectors or around the annulus is essential. A failure at that step leaves part of the chamber unlit and produces a badly distorted exit temperature pattern.
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