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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.
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]
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
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.
They were cleared to approach at 08:50 AZT (07:50 MSK, local time in Grozny), but due to the fog, the crew aborted the landing and initiated a go-around. They were cleared for a second landing attempt at 09:10 AZT (08:10 MSK), but again due to the fog, the crew aborted the landing and the crew informed controllers that they would be returning ...
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.