A transponder code, also known as a squawk code, is a four-digit numerical sequence that a pilot enters into their aircraft's radio transponder. These codes help air traffic controllers track and manage individual aircraft within the airspace. With 4096 possible combinations, squawk codes range from 0000 to 7777, with each combination serving as a unique identifier for an aircraft.
Here are the four primary squawk codes and their meanings:
- 7000: Indicates that the aircraft is operating under Visual Flight Rules (VFR), typically used for flights in uncontrolled airspace.
- 7500: Signals that the aircraft has been hijacked or is under unlawful interference.
- 7600: Indicates a radio communications failure between the aircraft and air traffic control.
- 7700: Indicates that the aircraft is experiencing an emergency or distress situation.
By using these squawk codes, pilots and air traffic controllers can communicate critical information efficiently and respond appropriately to various operational and emergency situations.
NOTE:
A good mnemonic to remember the three transponder codes indicating an aircraft in unusual flight conditions is, “75 blow up in the sky, 76 need a fix, 77 going to heaven”.
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