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Which callsign suffix would not normally be associated with an Air Traffic Control (ATC) service?

  • A

    Radio

  • B

    Radar

  • C

    Approach

  • D

    Director

Looking at the answer options:

Radio --> CORRECT. Radio is the call sign for an aeronautical station without an ATC Air Traffic Control service. This can be found, for example, at a smaller airfield as used by PPL type traffic.

Radar --> INCORRECT. Radar is used for an ATC service with directs en-route traffic, such as in an airway.

Approach --> INCORRECT. The ATC approach controller provides arrival and departure control without radar.

Director --> INCORRECT. Director is a type of ATC approach control service, used at busy airports such as London Heathrow. The Director vectors inbound aircraft under a radar service.

ICAO Annex 10, Volume II

5.2.1.7.1.2 The unit or service shall be identified in accordance with the table below except that the name of the location or the unit/service may be omitted provided satisfactory communication has been established.

Unit/service available Call sign suffix
area control centre (without radar) CONTROL
approach control (arrival and departure control service without radar) APPROACH
approach control radar arrivals ARRIVAL
approach control radar departures DEPARTURE
aerodrome control (responsible for take-off, landing and aircraft in the CTR) TOWER
surface movement control (responsible for all movements on the airport except the apron) GROUND
radar, in general (enroute services) RADAR
precision approach radar (guidance on final using specialised radar antennas) PRECISION
direction-finding station HOMER
flight information service INFORMATION
clearance delivery (transmission of enroute clearances) DELIVERY
apron control (aircraft guidance on the apron by the airport operator) APRON
company dispatch (transmission of flight regularity messages of aircraft operating agencies) DISPATCH
aeronautical station RADIO

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