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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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