Discussion
Arrange these steps of a normal gas turbine start in the order the instruments confirm them:
1. Rotor speed rises as the starter turns the engine
2. Fuel flow is introduced at the light-up speed
3. Exhaust gas temperature rises as combustion begins
4. Oil pressure rises with increasing rotor speed
5. The engine stabilises at idle and the starter cuts out
Select the correct sequence.
Answer: C
Each step has an instrument that confirms it, and the crew watches for a missing confirmation rather than for a fault message. A rising temperature without rising speed is the hung start the sequence is designed to catch.
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