Question: Question 1 8 . 1 2 : A pilot at near - equal distance from both engines of a twinengine aircraft notices that the sound

Question

18.12

: A pilot at near

-

equal distance from both engines of a twinengine aircraft notices that the sound rapidly varies in loudness with both engines running. Explain the cause of this variation and whether the pilot should be concerned for the safe operation of the aircraft.

Question 1 8 . 1 2 : A pilot at near - equal

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