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In August, a similar issue occurred when a Jet2 flight to Manchester made a priority landing at the northern airport after cabin crew declared an emergency squawk code 7700.
7700: ICAO: Emergency. [3] [7] 7701–7707 US: Reserved for special use by FAA. [3] 7710–7776 US: External ARTCC subset (block of discrete codes). [3] 7776 Europe The Mode A code 7776 is assigned as a test code by the ORCAM Users Group, specifically for the testing of transponders. [18] 7777 US, Germany, UK, Belgium, Netherlands
A pilot may be requested to squawk a given code by an air traffic controller, via the radio, using a phrase such as "Cessna 123AB, squawk 0363". The pilot then selects the 0363 code on their transponder and the track on the air traffic controller's radar screen will become correctly associated with their identity. [6] [7]
When the transponder receives an interrogation request, it broadcasts the configured transponder code (or "squawk code"). This is referred to as "Mode 3A" or more commonly, Mode A. A separate type of response called "Ident" can be initiated from the airplane by pressing a button on the transponder control panel.
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The co-pilot, however, was able to use the transponder to squawk 7700, alerting Chengdu Shuangliu International Airport control about their situation. Because the flight was within a mountainous region, the pilots were unable to descend to the required 8,000 ft (2,400 m) to compensate for the loss of cabin pressure.
This list of accidents and incidents involving commercial aircraft includes notable events that have a corresponding Wikipedia article. Entries in this list involve passenger or cargo aircraft that are operating commercially and meet this list's size criteria—passenger aircraft with a seating capacity of at least 10 passengers, or commercial cargo aircraft of at least 20,000 lb (9,100 kg).
The captain had approximately 15,500 flight hours, including 3,748 hours on the Boeing 747. The first officer had more than 7,700 hours with 4,553 of them on the Boeing 747, and the flight engineer had approximately 15,500 hours of flight time, including 4,363 hours on the Boeing 747. [1] The accident occurred while the main crew was on duty.