6 .5 Secondary surveillance radar
6.5.1 The following phrases together with their meanings are instructions which may be given by controllers to pilots regarding the operation of SSR transponders.
P
hrase Meaning
S QUAWK (code) Set the code as instructed
CONFIRM SQUAWK Confirm mode and code set on the transponder
RESET (mode) (code) Reselect assigned mode and code
SQUAWK IDENT Operate the "IDENT" feature
SQUAWK MAYDAY Select emergency code
SQUAWK STAND BY Select the stand by feature
SQUAWK CHARLIE Select pressure altitude transmission feature
CHECK ALTIMETER SETTING AND Check pressure setting and confirm present level
CONFIRM level
STOP SQUAWK CHARLIE WRONG Deselect pressure altitude transmission feature
INDICATION because of faulty operation
*VERIFY LEVEL Check and confirm your level
CHECK ID SQUAWK For a mode S equipped aircraft, check the setting of
the aircraft identification feature
*
Used to verify the accuracy of the Mode C derived level
information displayed to the controller.
6-6 Manual of Radiotelephony
6 .5.2 The pilot's reply to SSR instructions is usually either an acknowledgement or a read-back.
F
ASTAIR
345 ADVISE TYPE
OF
TRANSPONDER
F
ASTAIR
345 TRANSPONDER
CHARLIE
FASTAIR 345 SQUAWK 6411
6411 FASTAIR 345 FASTAIR 345 CONFIRM SQUAWK
FASTAIR 345 SQUAWKING 6411 FASTAIR 345 RESET 6411
FASTAIR 345 RECYCLING 6411
FASTAIR 345 CHECK ALTIMETER SETTING AND CONFIRM LEVEL
FASTAIR 345 ALTIMETER 1013 FLIGHT LEVEL 80
_ _ _ _ _ _ _ _
FASTAIR 345 CONFIRM TRANSPONDER OPERATING
FASTAIR 345 NEGATIVE, TRANSPONDER UNSERVICEABLE
6 .6 Radar assistance to aircraft with radiocommunications failure
When a controller suspects that an aircraft is able to receive but not transmit messages, the radar may be used to confirm that the pilot has received instructions.
Chapter 6. General radar phraseology 6-7
G-DCAB
REPLY NOT RECEIVED IF
YOU READ ALEXANDER CONTROL
TURN LEFT HEADING 040
G-DCAB TURN OBSERVED
POSITION 5 MILES SOUTH OF
WICKEN VOR WILL CONTINUE
RADAR CONTROL
_ _ _ _ _ _ _ _
FASTAIR 345 REPLY NOT RECEIVED IF YOU READ
ALEXANDER CONTROL SQUAWK IDENT
FASTAIR 345 SQUAWK OBSERVED 5 MILES SOUTH OF
WICKEN VOR WILL CONTINUE RADAR CONTROL
N ote.— An aircraft experiencing a radiocommunications failure is expected to select SSR code 7600.
6.7 Alerting phraseologies
6.7.1 In the event that a minimum safe altitude warning (MSAW) is generated in respect of a controlled flight, the air traffic controller will inform the aircraft and issue appropriate instructions.
F
ASTAIR
345 LOW ALTITUDE WARNING,
CHECK YOUR ALTITUDE IMMEDIATELY,
QNH IS 1006, THE MINIMUM FLIGHT
ALTITUDE IS 1 450 FEET
_ _ _ _ _ _ _ _
FASTAIR 345 TERRAIN ALERT,
CLIMB TO 2 000 FEET QNH 1006
6-8 Manual of Radiotelephony
6 .7.2 Avoiding action to be taken by the pilot is given when the controller considers that an imminent risk of collision will exist if action is not taken immediately.
F
ASTAIR
345 TURN RIGHT IMMEDIATELY
HEADING 110 TO AVOID TRAFFIC