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39  Read-back of the assigned speed.  ASSIGNED SPEED (speed)  N  M  N 
40  Read-back of the assigned route.  ASSIGNED ROUTE (route clearance)  N  M  N 
41  The aircraft has regained the cleared route.  BACK ON ROUTE  N  M  N 
42  The next waypoint is the specified position.  NEXT WAYPOINT (position)  N  L  N 
43  The ETA at the next waypoint is as specified.  NEXT WAYPOINT ETA (time)  N  L  N 
44  The next but one waypoint is the specified position.  ENSUING WAYPOINT (position)  N  L  N 
45  Clarification of previously reported waypoint passage.  REPORTED WAYPOINT (position)  N  L  N 
46  Clarification of time over previously reported waypoint.  REPORTED WAYPOINT (time)  N  L  N 
47  The specified (SSR) code has been selected.  SQUAWKING (code)  N  L  N 
48  Position report.  POSITION REPORT (position  report)  N  M  N 
79  The code of the latest ATIS received is as specified.  ATIS (atis code)  N  L  N 
89  The specified ATS unit is being monitored on the specified frequency.  MONITORING (unit name) (frequency)  U  M  N 
102  Used to report that an aircraft has landed.  LANDING REPORT  N  N  N 
104  Notification of estimated time of arrival at the specified position.  ETA (position) (time)  L  L  N 
105  Notification of the alternative aerodrome for landing.  ALTERNATE AERODROME (airport)  L  L  N 
106  Notification of the preferred level.  PREFERRED LEVEL (level)  L  L  N 
109  Notification of the preferred time to commence descent for approach.  TOP OF DESCENT (time)  L  L  N 
110  Notification of the preferred position to commence descent for approach.  TOP OF DESCENT (position)  L  L  N 
111  Notification of the preferred time and position to commence descent for approach.  TOP OF DESCENT (time) (position)  L  L  N 

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 A5-20. Negotiation requests (downlink)
Message intent/use  Message element  URG  ALRT  RESP 
49  Request for the earliest time at which a clearance to the specified speed can be expected.  WHEN CAN WE EXPECT (speed)  L  L  Y 
50  Request for the earliest time at which a clearance to a speed within the specified range can be expected.  WHEN CAN WE EXPECT (speed) TO (speed)  L  L  Y 
51  Request for the earliest time at which a clearance to regain the planned route can be expected.  WHEN CAN WE EXPECT BACK ON ROUTE  L  L  Y 
52  Request for the earliest time at which a clearance to descend can be expected.  WHEN CAN WE EXPECT LOWER LEVEL  L  L  Y 
53  Request for the earliest time at which a clearance to climb can be expected.  WHEN CAN WE EXPECT HIGHER LEVEL  L  L  Y 
54  Request for the earliest time at which a clearance to cruise climb to the specified level can be expected.  WHEN CAN WE EXPECT CRUISE CLIMB TO (level)  L  L  Y 
87  Request for the earliest time at which a clearance to climb to the specified level can be expected.  WHEN CAN WE EXPECT CLIMB TO (level)  L  L  Y 
88  Request for the earliest time at which a clearance to descend to the specified level can be expected.  WHEN CAN WE EXPECT DESCENT TO (level)  L  L  Y 
　
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