During flights, various chimes communicate important information between pilots and cabin crew. A double chime signals that the aircraft has crossed 10,000 feet, allowing flight attendants to move about and passengers to use electronic devices. Prior to this altitude, a 'sterile cockpit' is in effect, meaning pilots focus solely on flying. A single chime often indicates assistance requests or changes in the seatbelt sign. Three chimes signal an emergency situation, though this occurrence is rare.
A double chime sound is the pilot signalling to the cabin crew that the plane has gone through 10,000 feet of altitude. After passing 10,000 feet and the double chime rings, cabin crew can move around more freely.
The single chime is used when someone presses a button for assistance, or when the seat belt sign turns on or off. It may also be used alongside an important announcement.
Three chime sounds can be more serious, but are rare. Daniel revealed the sound signifies an emergency situation.
Pilots are focused on their task without menial distractions before reaching 10,000 feet, which is known as a 'critical phase of flight'.
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