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Assertion (A): Engine pressure ratio is cross-checked against rotor speed and fuel flow after setting thrust.

Reason (R): A blocked pressure probe can make the ratio indicate a value the engine is not producing.

Select the correct answer from the options below.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason is precisely why the cross-check is made. A blocked or iced pressure probe corrupts the ratio without any warning, so the instrument can read the target value while the engine produces something quite different.

Rotor speed, fuel flow and exhaust gas temperature are sensed independently of the EPR system, so agreement between them and the setting confirms it, and disagreement exposes the fault. On take-off the consequence of not checking is thrust materially below that intended, discovered only when the acceleration proves poor.

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