In addition to the previous chapters relates to the ‘Flight Deck Sound System", I wondered how much the ‘SPL’ (Sound Pressure Level) is in a B737-800 Cockpit.

Some allied B737-800 pilots at Ryanair have a while ago for me the test on the sum taken by a measurement to do on cruisehoogte (FL370).

This measurement is done via an App on their IPhone and not using a calibrated meter vibration. So the result is not 100% correct but it gives us an idea.

Further info regarding this test is found on page http://www.flightdeck737.be/pc/sounds/flight-deck-sound-system/

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