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Home > Exam Questions > EASA PPL(A) - Private Pilot Licence (Aeroplane) > Aircraft General Knowledge > What is the correct operational meaning of vacuum-driven instruments?

257 - EASA PPL(A) Theory Exam Questions in English - What is the correct operational meaning of vacuum-driven instruments?

Question 257 - Aircraft General Knowledge - EASA PPL(A) - Private Pilot Licence (Aeroplane)

The associated attitude and heading indicators remain reliable until they stop moving completely.

The magnetic compass necessarily fails at the same time as a vacuum-driven gyro.

A normal airspeed indication proves the vacuum-driven gyros are serviceable.

A vacuum failure can make associated gyro instruments unreliable

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