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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Aircraft General Knowledge - Airframe, Systems, Powerplant > With a naturally aspirated piston engine running normally at idle on the ground, and no ram-pressure boost, the manifold pressure gauge indicates:

425 - ATPL Question Bank in English - With a naturally aspirated piston engine running normally at idle on the ground, and no ram-pressure boost, the manifold pressure gauge indicates:

Question 425 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot Licence

A greater value than atmospheric pressure when the engine is running.

A lower value than atmospheric pressure when the engine is running.

A value equal to the QFE when the engine is at full power on the ground.

Zero on the ground when the engine is stopped.

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