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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 discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...
The plane reportedly issued a 7700 squawk alert, ... occurred when a Jet2 flight to Manchester made a priority landing at the northern airport after cabin crew declared an emergency squawk code 7700.
For uncontrolled aircraft, codes generally use only the first two digits so that they could also be read on older military ground equipment. For instance, the standard code to identify an aircraft flying under visual flight rules in North America is 1200, while emergency is, as with the military codes, 7700. [22] Mode B and D remain unused. [17]
The aircraft sent a “squawk code” of 7700 at that time, an international emergency signal. “Singapore Airlines offers its deepest condolences to the family of the deceased,” the airline said.
This was because the TCAS was disabled due to the electrical failure on EZY6074 and the TCAS needs to work on both aircraft to detect each other. Moments later, the pilots of EasyJet Flight 6074 managed to reconfigure their transponder and then a minute later, the code changed to the number 7700, or the General Emergency code number.
Aircraft can also signal an emergency by setting one of several special transponder codes, such as 7700. The COSPAS/SARSAT signal can be transmitted by an Electronic Locator Transmitter or ELT, which is similar to a marine EPIRB on the 406 MHz radiofrequency.
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.