Secondary surveillance radar (SSR)

The following phrases together with their meanings are instructions which may be given by controllers to pilots regarding the operation of SSR transponders.

Phrases

Meaning

Audio

CONFIRM SQUAWK (code)

Confirm the code set on the transponder

RESET SQUAWK (mode) (code)

Reselect assigned mode and/or code

SQUAWK IDENT

Operate the special position identification feature

SQUAWK STANDBY

Suspend transponder operation (Select the standby feature)

CHECK ALTIMETER SETTING AND CONFIRM level

Check altimeter pressure setting and confirm present level (to nearest 100ft)

STOP SQUAWK CHARLIE WRONG INDICATION

Deselect pressure altitude feature because of faulty operation

* VERIFY level

Check and confirm present level (to nearest 100ft)

RESET MODE S IDENTIFICATION

For a mode S equipped aircraft, request reselection of aircraft identification

*Used to verify the accuracy of the Mode C derived level information displayed to the controller.

The pilot reply to SSR instructions is usually either an acknowledgement or readback.

FASTFLY 123 SQUAWK 6214

6214 FASTFLY 123

FASTFLY 123 CONFIRM SQUAWK

FASTFLY 123 SQUAWKING 6214

FASTFLY 123 RESET SQUAWK 6214

RESETTING 6214 FASTFLY 123

FASTFLY 123 CHECK ALTIMETER SETTING AND CONFIRM LEVEL

FASTFLY 123 ALTIMETER 1013 FLIGHT LEVEL 90

FASTFLY 123 CONFIRM TRANSPONDER OPERATING

FASTFLY 123 NEGATIVE, TRANSPONDER UNSERVICEABLE