Discussion
An engine is set to its target engine pressure ratio for take-off, but rotor speed, fuel flow and exhaust gas temperature are all noticeably lower than usual for that setting.
What should be suspected?
Answer: D
Correct answer: A blocked or iced engine pressure ratio probe
Rotor speed, fuel flow and exhaust gas temperature are independent of the EPR sensing system, and all three agree with each other in saying the engine is producing less than the target setting suggests. When one indication disagrees with three that concur, suspect that indication.
A blocked or iced pressure probe corrupts the ratio and lets the crew set less thrust than intended - a serious matter on take-off, where the shortfall may not be apparent until the acceleration is visibly poor. It is why probe heating is required and why the secondary parameters are cross-checked against the setting.
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