ICAO 24 Bit Aircraft Address - Flight ID Explanation

The ICAO 24 bit aircraft address is assigned by the IOMAR to the specific airframe whilst the aircraft remains on the Isle of Man Aircraft Register and a change to another ‘M’ registration mark will not require the issue of a new 24 bit aircraft address.

It is good practice to periodically carry out verification checks using a mode S external receiver to ensure the aircraft is transmitting the correct hexadecimal code and especially when the aircraft undergoes a major maintenance check.

The Flight ID must be inserted in to the Mode S Aircraft Identification input device in the cockpit by the flight crew prior to each flight. The Flight ID must correspond to the aircraft identification that is recorded in item 7 of the ICAO flight plan.

The flight ID will either be:

  • The three letter ICAO designator for the aircraft operating agency, followed by the flight identification

or:

  • The registration mark of the aircraft.
  • The three letter ICAO designator for the aircraft operating agency, followed by the flight identification (e.g. BAW123). When this is entered at Item 7, the R/T call sign used will consist of the ICAO telephony designator for the operating agency followed by the flight identification (in this example: "Speedbird 123").

[See ICAO Doc 8585 - "Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services", for code/de-code information].

  • the Registration Marking of the aircraft (e.g. FGZCF). When this is entered, the R/T call sign to be used will consist of this identification alone (e.g. "FGZCF"), or preceded by the ICAO telephony designator for the aircraft operating agency (e.g."Airfrans FGZCF").

NOTE: What is entered at Item 7 must match exactly what is entered in the Mode S Aircraft Identification (also known as Flight ID) input device in the cockpit. If it does not, then the aircraft will not be correlated with its stored flight plan and delays will ensue.

There must be no spaces ahead of or between the designator letters and flight number, nor any additional/superfluous zeros. If the input device requires all character boxes to be filled, enter spaces after the flight number.

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