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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 ...
Hughes Airwest Flight 706 The wreckage of Hughes Airwest Flight 706 at its crash site Accident Date June 6, 1971 (1971-06-06) 18:11 (6:11 PM) PDT Summary Mid-air collision Site San Gabriel Mountains, Los Angeles County, California, United States 34°10′30″N 118°00′00″W / 34.175°N 118.00°W / 34.175; -118.00 Total fatalities 50 Total survivors 1 First aircraft N9345, the ...
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.
Three special-purpose codes are also used, 7500 means the aircraft is being hijacked, 7600 means their voice radio set is not working, and 7700 is a general emergency. [22] For mode C, the altitude is encoded using Gillham code, using 11 bits. The lowest possible code is 000000000001, representing an altitude of -1200 feet.
The U.S. National Highway Traffic Safety Administration is upgrading a probe into Ford's BlueCruise technology following reports of collisions.
The transponder code was changed to 7600 (to indicate radio failure) at 15:09 UTC and subsequently to 7700 (emergency) at 15:26 UTC while on final approach. The secondary radio (VHF2) remained operative and the crew were able to restore communication with air traffic control (ATC) and made a pan-pan call on the emergency frequency.
A coalition of nonprofit aid groups said Wednesday at an emergency hearing that the Trump administration's "opaque and chaotic" 90-day pause on foreign aid had already "devastated" their ...