Discussion
Arrange these steps of setting take-off power on a turbofan:
1. Read the ambient temperature and pressure
2. Look up the target engine pressure ratio for the conditions
3. Advance the thrust levers
4. Confirm the target ratio is achieved
5. Cross-check rotor speeds, fuel flow and exhaust gas temperature
Select the correct sequence.
Answer: B
The target depends on the day's conditions, so it cannot be a fixed number. The final cross-check exists because a blocked pressure probe would let the ratio indicate correctly while the engine is not actually at that thrust.
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