Rules of the Air and Air Traffic Services(164)

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96  Instruction to continue to fly on the current heading.  CONTINUE PRESENT HEADING  N  M  W/U 
97  Instruction to fly on the specified heading from the specified position.  AT (position) FLY HEADING (degrees)  N  M  W/U 
221  Instruction to stop turn at the specified heading prior to reaching the previously assigned heading.  STOP TURN HEADING (degrees)  U  M  W/U 
98  Instruction to turn immediately left or right as specified on to the specified heading.  IMMEDIATELY TURN (direction) HEADING (degrees)  D  H  W/U 
99  Notification that a clearance may be issued for the aircraft to fly the specified procedure.  EXPECT (procedure name)  L  L  R 

Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
No. 2

Table A5-6. Speed changes (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
100  Notification that a speed instruction may be issued to be effective at the specified time.  AT (time) EXPECT (speed)  L  L  R 
101  Notification that a speed instruction may be issued to be effective at the specified position.  AT (position) EXPECT (speed)  L  L  R 
102  Notification that a speed instruction may be issued to be effective at the specified level.  AT (level) EXPECT (speed)  L  L  R 
103  Notification that a speed range instruction may be issued to be effective at the specified time.  AT (time) EXPECT (speed) TO (speed)  L  L  R 
104  Notification that a speed range instruction may be issued to be effective at the specified position.  AT (position) EXPECT (speed) TO (speed)  L  L  R 
105  Notification that a speed range instruction may be issued to be effective at the specified level.  AT (level) EXPECT (speed) TO (speed)  L  L  R 
106  Instruction that the specified speed is to be maintained.  MAINTAIN (speed)  N  M  W/U 
188  Instruction that after passing the specified position the specified speed is to be maintained.  AFTER PASSING (position) MAINTAIN (speed)  N  M  W/U 
107  Instruction that the present speed is to be maintained.  MAINTAIN PRESENT SPEED  N  M  W/U 
108  Instruction that the specified speed or a greater speed is to be maintained.  MAINTAIN (speed) OR GREATER  N  M  W/U 
109  Instruction that the specified speed or a lesser speed is to be maintained.  MAINTAIN (speed) OR LESS  N  M  W/U 
110  Instruction that a speed within the specified range is to be maintained.  MAINTAIN (speed) TO (speed)  N  M  W/U 
111  Instruction that the present speed is to be increased to the specified speed and maintained until further advised.  INCREASE SPEED TO (speed)  N  M  W/U 
112  Instruction that the present speed is to be increased to the specified speed or greater, and maintained at or above the specified speed until further advised.  INCREASE SPEED TO (speed) OR GREATER  N  M  W/U 
113  Instruction that the present speed is to be reduced to the specified speed and maintained until further advised.  REDUCE SPEED TO (speed)  N  M  W/U 
114  Instruction that the present speed is to be reduced to the specified speed or less and maintained at or below the specified speed until further advised.  REDUCE SPEED TO (speed) OR LESS  N  M  W/U 

Message intent/use  Message element  URG  ALRT  RESP 
　
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