One of the most well-known is a 'Code Bravo,' which means that there has been a security breach/threat. In airports, security staff may issue the call 'Bravo, Bravo, Bravo' and order everyone to freeze, to help them identify a suspect.
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A Code Blue announcement provides an immediate security awareness alert to all airport workers that a security concern is perceived by another airport worker and the report is being investigated.
Former pilot Bubb told Newsweek that two dings mean the plane is climbing through 10,000 feet and/or the pilots are asking flight attendants to prepare the cabin for landing. A whoosh sound means the landing gear is extending in preparation for landing, Bubb added.
Alert 3: Indicates that an aircraft has crashed on or off the airport, or there is a high probability the aircraft will crash, or the pilot has indicated that the aircraft landing gear will not work and, therefore, the pilot will have to crash land on the airport.