Rules of the Air and Air Traffic Services(165)

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115  Instruction that the specified speed is not to be exceeded.  DO NOT EXCEED (speed)  N  M  W/U 
116  Notification that the aircraft need no longer comply with the previously issued speed restriction.  RESUME NORMAL SPEED  N  M  W/U 
189  Instruction that the present speed is to be changed to the specified speed.  ADJUST SPEED TO (speed)  N  M  W/U 
222  Notification that the aircraft may keep its preferred speed without restriction.  NO SPEED RESTRICTION  L  L  R 
223  Instruction to reduce present speed to the minimum safe approach speed  REDUCE TO MINIMUM APPROACH SPEED  N  M  W/U 

Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
Table A5-7. Contact/monitor/surveillance requests (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
117  Instruction that the ATS unit with the specified ATS unit name is to be contacted on the specified frequency.  CONTACT (unit name) (frequency)  N  M  W/U 
118  Instruction that at the specified position the ATS unit with the specified ATS unit name is to be contacted on the specified frequency.  AT (position) CONTACT (unit name) (frequency)  N  M  W/U 
119  Instruction that at the specified time the ATS unit with the specified ATS unit name is to be contacted on the specified frequency.  AT (time) CONTACT (unit name) (frequency)  N  M  W/U 
120  Instruction that the ATS unit with the specified ATS unit name is to be monitored on the specified frequency.  MONITOR (unit name) (frequency)  N  M  W/U 
121  Instruction that at the specified position the ATS unit with the specified ATS unit name is to be monitored on the specified frequency.  AT (position) MONITOR (unit name) (frequency)  N  M  W/U 
122  Instruction that at the specified time the ATS unit with the specified ATS unit name is to be monitored on the specified frequency.  AT (time) MONITOR (unit name) (frequency)  N  M  W/U 

No. 2

Message intent/use  Message element  URG  ALRT  RESP 
123  Instruction that the specified code (SSR code) is to be selected.  SQUAWK (code)  N  M  W/U 
124  Instruction that the SSR transponder responses are to be disabled.  STOP SQUAWK  N  M  W/U 
125  Instruction that the SSR transponder responses should include level information.  SQUAWK MODE CHARLIE  N  M  W/U 
126  Instruction that the SSR transponder responses should no longer include level information.  STOP SQUAWK MODE CHARLIE  N  M  W/U 
179  Instruction that the ‘ident’ function on the SSR transponder is to be actuated.  SQUAWK IDENT  N  M  W/U 

Table A5-8. Report/confirmation requests (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
127  Instruction to report when the aircraft is back on the cleared route.  REPORT BACK ON ROUTE  N  L  W/U 
128  Instruction to report when the aircraft has left the specified level.  REPORT LEAVING (level)  N  L  W/U 
129  Instruction to report when the aircraft is maintaining level flight at the specified level.  REPORT MAINTAINING (level)  N  L  W/U 
175  Instruction to report when the aircraft has reached the specified level.  REPORT REACHING (level)  N  L  W/U 
200  Instruction used in conjunction with a level clearance to report reaching the level assigned.  REPORT REACHING  N  L  W/U 
　
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