Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
Table A5-9. Negotiation requests (uplink)
Message intent/use Message element URG ALRT RESP
148 Request for the earliest time at which the specified level can be accepted. WHEN CAN YOU ACCEPT (level) N L Y
149 Instruction to report whether or not the specified level can be accepted at the specified position. CAN YOU ACCEPT (level) AT (position) N L A/N
150 Instruction to report whether or not the specified level can be accepted at the specified time. CAN YOU ACCEPT (level) AT (time) N L A/N
151 Instruction to report the earliest time when the specified speed can be accepted. WHEN CAN YOU ACCEPT (speed) N L Y
152 Instruction to report the earliest time when the specified offset track can be accepted. WHEN CAN YOU ACCEPT (specified distance) (direction) OFFSET N L Y
Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
Table A5-10. Air traffic advisories (uplink)
Message intent/use Message element URG ALRT RESP
153 ATS advisory that the altimeter setting should be the specified setting. ALTIMETER (altimeter) N L R
213 ATS advisory that the specified altimeter setting relates to the specified facility. (facility designation) ALTIMETER (altimeter) N L R
Message intent/use Message element URG ALRT RESP
154 ATS advisory that the radar service is terminated. RADAR SERVICE TERMINATED N L R
191 ATS advisory that the aircraft is entering airspace in which no air traffic services are provided and all existing air traffic services are terminated. ALL ATS TERMINATED N M R
155 ATS advisory that radar contact has been established at the specified position. RADAR CONTACT (position) N M R
156 ATS advisory that radar contact has been lost. RADAR CONTACT LOST N M R
210 ATS advisory that the aircraft has been identified on radar at the specified position. IDENTIFIED (position) N M R
193 Notification that radar identification has been lost. IDENTIFICATION LOST N M R
157 Notification that a continuous transmission is detected on the specified frequency. Check the microphone button. CHECK STUCK MICROPHONE (frequency) U M N
158 ATS advisory that the ATIS information identified by the specified code is the current ATIS information. ATIS (atis code) N L R
212 ATS advisory that the specified ATIS information at the specified airport is current. (facility designation) ATIS (atis code) CURRENT N L R
214 ATS advisory that indicates the RVR value for the specified runway. RVR RUNWAY (runway) (rvr) N M R
224 ATS advisory that no delay is expected. NO DELAY EXPECTED N L R
225 ATS advisory that the expected delay has not been determined. DELAY NOT DETERMINED N L R
226 ATS advisory that the aircraft may expect to be cleared to commence its approach procedure at the specified time. EXPECTED APPROACH TIME (time) N L R
No. 2
Table A5-11. System management messages (uplink)
Message intent/use Message element URG ALRT RESP
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