Air Canada enRoute

Music to a pilot’s ear

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There are all sorts of sounds that emanate from a plane, and when you fly frequently, you begin to hear them as a kind of symphony (or perhaps cacophony). The harmonic buzzing noise resonating from the narrow-body Airbus engines during takeoff; the whirring of hydraulic jacks when extending or retracting the flaps on the trailing edge of the wing; the barking dog sound from the hydraulic pump in the Airbus fleet during taxi; or the hissing that comes from the APU (Auxiliary Power Unit) in the tail that supplies conditione­d air and ground power. And, of course, the staccato of seatbelts simultaneo­usly unclicking once you’ve arrived at your destinatio­n. It’s all part of the aviation orchestra.

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