Change of Radiotelephony call Sign for Aircraft

AERODROME CONTROL TOWER may instruct an aircraft to change its type of RTF call sign, in the interests of safety, when similarity between two or more aircraft RTF call sign is such that confusion is likely to occur.

Any such change to the type of call sign shall be temporary and shall be applicable only within the vicinity of SHE aerodrome.

To avoid confusion, AERODROME CONTROL TOWER should, if appropriate, identify the aircraft which will be instructed to change its call sign by referring to its position and/or level.

When AERODROME CONTROL TOWER changes the type of call sign of an aircraft, AERODROME CONTROL TOWER shall ensure that the aircraft reverts to the call sign indicated by the flight plan when the aircraft is transferred to SEAHORSE APPROACH CONTROL OFFICE, except when the call sign change has been coordinated between the two ATC units concerned.

AERODROME CONTROL TOWER shall advise the aircraft concerned when it is to revert to the call sign indicated by the flight plan.

Read Handling Of Abnormal Situations Air Traffic Control