Essentially, the chimes are how crew communicate with each other, and each chime indicates a different code; one chime has a different meaning than two or three chimes.
“Have you ever heard these sounds on a plane before? Do you ever wonder what that means?” Tommy said.“If you hear just one tone, that means that a passenger is calling one of the flight attendants from their seat or they could be calling us from the lavatory,” Tommy said.
And a high ding followed by a low sound has a different meaning – a crew member is trying to communicate with another teammate or the flight deck is trying to call the flight attendants.
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