Appendix F Table F-15. Voice Communication Uplink Messages (COMU) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 COMU-1 Instruction to establish voice contact with the specified ATSU on the specified frequency.
CONTACT (unit name) (frequency) W/U UM117 CONTACT (ICAO unit name) (frequency) UM117 CONTACT (unit name) (frequency) COMU-2 Instruction at the specified position, to establish voice contact with the specified ATSU on the specified frequency.
AT (position) CONTACT (unit name) (frequency) W/U UM118 AT (position) CONTACT (ICAO unit name) (frequency) N/A COMU-3 Instruction at the specified time, to establish voice contact with the specified ATSU on the specified frequency.
AT TIME (time) CONTACT (unit name) (frequency) W/U UM119 AT (time) CONTACT (ICAO unit name) (frequency) N/A COMU-4 Advisory of the secondary frequency.
SECONDARY FREQUENCY (frequency) R UM169 ‘SECONDARY
FREQUENCY (frequency)’ N/A COMU-5 Instruction to monitor the specified ATSU on the specified frequency. The pilot is not required to establish voice contact on the frequency.
MONITOR (unit name) (frequency) W/U UM120 MONITOR (ICAO unit name) (frequency) UM120 MONITOR (unit name) (frequency) COMU-6 Instruction at the specified position, to monitor the specified ATSU on the specified frequency. The pilot is not required to establish voice contact on the frequency.
AT (position) MONITOR (unit name) (frequency) W/U UM121 AT (position) MONITOR (ICAO unit name) (frequency) N/A F-37
Appendix F Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 COMU-7 Instruction that at the specified time, to monitor the specified ATSU on the specified frequency. The pilot is not required to establish voice contact on the frequency.
AT TIME (time) MONITOR (unit name) (frequency) W/U UM122 AT (time) MONITOR (ICAO unit name) (frequency) N/A COMU-8 Instruction to check the microphone due to detection of a continuous transmission on the specified frequency.
CHECK STUCK MICROPHONE (frequency) N UM157 CHECK STUCK
MICROPHONE (frequency) Note: R response attribute.
UM157 CHECK STUCK
MICROPHONE (frequency) COMU-9 Advisory of the name of the current ATC unit.
CURRENT ATC UNIT (unit name) N N/A UM183 ‘CURRENT
ATC UNIT (unit name)’ F-38
Appendix F Table F-16. Voice Communication Downlink Messages (COMD) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 COMD-1 Request for voice contact on the specified frequency.
REQUEST VOICE CONTACT (frequency) Y DM20 REQUEST
VOICE CONTACT Note: Used when a frequency is not required.
DM21 REQUEST
VOICE CONTACT (frequency) Note: Used when a frequency is required.
N/A COMD-2 Notification from the intermediary aircraft of the specified response from the specified aircraft.
RELAY FROM (aircraft identification) (relayed text response) N DM67 ‘RELAY FROM (call sign) (response parameters)’ N/A F-39
Appendix F Table F-17. Spacing Uplink Messages (SPCU) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 SPCU-1 ATS acknowledgement for the pilot use of the in-trail procedure when the ITP aircraft is behind the reference aircraft. This message element is always concatenated with a vertical clearance.
ITP BEHIND (aircraft identification) N UM169 ‘ITP BEHIND (aircraft identification)’ Note: R response attribute.
N/A SPCU-2 ATS acknowledgement for the pilot use of the in-trail procedure when the ITP aircraft is ahead of the reference aircraft. This message element is always concatenated with a vertical clearance.
ITP AHEAD OF (aircraft identification) N UM169 ‘ITP AHEAD OF (aircraft identification)’ Note: R response attribute.
N/A SPCU-3 ATS acknowledgement for the pilot use of the in-trail procedure when the ITP aircraft is behind both reference aircraft. This message element is always concatenated with a vertical clearance.
ITP BEHIND (aircraft identification) AND BEHIND (aircraft identification) N UM169 ‘ITP BEHIND (aircraft identification)
AND BEHIND (aircraft identification)’ Note: R response attribute.
N/A SPCU-4 ATS acknowledgement for the pilot use of the in-trail procedure when the ITP aircraft is ahead of both reference aircraft. This message element is always concatenated with a vertical clearance.
ITP AHEAD OF (aircraft identification) AND AHEAD OF (aircraft identification) N UM169 ‘ITP AHEAD OF (aircraft identification) AND AHEAD OF (aircraft identification)’ Note: R response attribute.
N/A F-40
Appendix F Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 SPCU-5 ATS acknowledgement for the pilot use of the in-trail procedure when the ITP aircraft is behind one reference aircraft and ahead of one reference aircraft. This message element is always concatenated with a vertical clearance.
ITP BEHIND (aircraft identification) AND AHEAD OF (aircraft identification) N UM169 ‘ITP BEHIND (aircraft identification)
AND AHEAD OF (aircraft identification)’ Note: R response attribute.
N/A F-41
Appendix F Table F-18. Spacing Downlink Messages (SPCD) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 SPCD-1 Advisory indicating that the pilot has the ITP equipment, and provides the specified distance to the reference aircraft, including aircraft identification. This message element is always concatenated with a vertical request.
ITP (specified distance) BEHIND (aircraft identification) N DM67 ‘ITP (distance) BEHIND (aircraft identification)’ N/A SPCD-2 Advisory indicating that the pilot has the ITP equipment, and provides the specified distance from the reference aircraft, including aircraft identification.
This message element is always concatenated with a vertical request.
ITP (specified distance) AHEAD OF (aircraft identification) N DM67 ‘ITP (distance) AHEAD OF (aircraft identification)’ N/A SPCD-3 Advisory indicating that the pilot has the ITP equipment, and provides the specified distance to both reference aircraft, including aircraft identification. This message element is always concatenated with a vertical request.
ITP (specified distance) BEHIND (aircraft identification) AND (specified distance) BEHIND (aircraft identification) N DM67 ‘ITP (distance) BEHIND (aircraft identification) AND (distance) BEHIND (aircraft identification')’ Note: Used with a vertical request, indicating an ITP request when there are two reference aircraft, both behind.
N/A F-42
Appendix F Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 SPCD-4 Advisory indicating that the pilot has the ITP equipment, and provides the specified distance from both reference aircraft, including aircraft identification.
This message element is always concatenated with a vertical request.
ITP (specified distance) AHEAD OF (aircraft identification) AND (specified distance) AHEAD OF (aircraft identification) N DM67 ‘ITP (distance) AHEAD OF (aircraft identification) AND (distance) AHEAD OF (aircraft identification)’ Note: Used with a vertical request, indicating an ITP request when there are two reference aircraft, both ahead.
N/A SPCD-5 Advisory indicating that the pilot has the ITP equipment, and provides the specified distance to one reference aircraft and the specified distance from another reference aircraft, including aircraft identification. This message element is always concatenated with a vertical request.
ITP (specified distance) BEHIND (aircraft identification) AND (specified distance) AHEAD OF (aircraft identification) N DM67 ‘ITP (distance) BEHIND (aircraft identification) AND (distance) AHEAD OF (aircraft identification)’ Note: Used with a vertical request, indicating an ITP request when there are two reference aircraft, one behind and the other ahead.
N/A F-43
Appendix F Table F-19. Emergency/Urgency Uplink Messages (EMGU) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 EMGU-1 Request to provide the fuel remaining (time) and the number of persons on board.
REPORT ENDURANCE
AND PERSONS ON BOARD Y UM131 REPORT
REMAINING FUEL
AND SOULS ON BOARD Note: NE response attribute.
N/A EMGU-2 Instruction to immediately comply with the associated instruction to avoid imminent situation.
IMMEDIATELY N Used in combination with LVLU-6 and LVLU-9, which is implemented in FANS 1/A as:
UM38
IMMEDIATELY CLIMB TO (altitude) UM39
IMMEDIATELY
DESCEND TO (altitude) N/A EMGU-3 Request to confirm an ADS- C indicated emergency.
CONFIRM ADS-C
EMERGENCY A/N UM169 ‘CONFIRM ADS-C EMERGENCY’ Note: R response attribute.
N/A F-44
Appendix F Table F-20. Emergency/Urgency Downlink Messages (EMGD) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 EMGD-1 Indication of an urgent situation. PAN PAN PAN Y DM55 PAN PAN PAN Note: N response attribute.
N/A EMGD-2 Indication of an emergency situation.
MAYDAY MAYDAY MAYDAY Y DM56 MAYDAY
MAYDAY MAYDAY Note: N response attribute.
N/A EMGD-3 Report indicating fuel remaining (time) and number of persons on board.
(remaining fuel) ENDURANCE AND (persons on board) PERSONS ON BOARD Y DM57 (remaining fuel)
OF FUEL REMAINING AND (remaining souls)
SOULS ON BOARD Note: N response attribute.
N/A EMGD-4 Indication that the emergency situation is cancelled.
CANCEL EMERGENCY Y DM58 CANCEL
EMERGENCY Note: N response attribute.
N/A F-45
Appendix F Table F-21. Standard Response Uplink Messages (RSPU) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 RSPU-1 Indication that the message cannot be complied with.
UNABLE N UM0 UNABLE UM0 UNABLE RSPU-2 Indication that the message will be responded to shortly.
STANDBY N UM1 STANDBY UM1 STANDBY RSPU-3 Indication that a long term delay in response can be expected.
REQUEST DEFERRED N UM2 REQUEST
DEFERRED N/A RSPU-4 Indication that the message is received.
ROGER N UM3 ROGER UM169 ‘ROGER MAYDAY’ Note 1: R response attribute.
Note 2: Used to acknowledge emergency downlink reports.
UM169 ‘ROGER PAN’ Note 1: R response attribute.
Note 2: Used to acknowledge urgency downlink reports.
UM3 ROGER RSPU-5 Indication that ATC is responding positively to the message.
AFFIRM N UM4 AFFIRM UM4 AFFIRM RSPU-6 Indication that ATC is responding negatively to the message.
NEGATIVE N UM5 NEGATIVE UM5 NEGATIVE F-46
Appendix F Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 RSPU-7 Indication that the request has been forwarded to the next control unit.
REQUEST FORWARDED N UM169 ‘REQUEST FORWARDED’ Note: R response attribute.
UM211 REQUEST
FORWARDED RSPU-8 Request to confirm the referenced request since the initial request was not understood. The request should be clarified and resubmitted.
CONFIRM REQUEST N UM143 CONFIRM
REQUEST N/A Table F-22. Standard Response Downlink Messages (RSPD) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 RSPD-1 Indication that the instruction is understood and will be complied with.
WILCO N DM0 WILCO DM0 WILCO RSPD-2 Indication that the instruction cannot be complied with.
UNABLE N DM1 UNABLE DM1 UNABLE RSPD-3 Indication that the message will be responded to shortly.
STANDBY N DM2 STANDBY DM2 STANDBY RSPD-4 Indication that the message is received.
ROGER N DM3 ROGER Note: ROGER is the only correct response to an uplink free text message.
DM3 ROGER RSPD-5 Indication of a positive response to a message.
AFFIRM N DM4 AFFIRM DM4 AFFIRM RSPD-6 Indication of a negative response to a message.
NEGATIVE N DM5 NEGATIVE DM5 NEGATIVE F-47
Appendix F Table F-23. Supplemental Uplink Messages (SUPU) Operational Definition in PANS-ATM (Doc 4444) CPDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 SUPU-1 Indication that the associated instruction is to be executed when the pilot is ready.
WHEN READY N UM164 WHEN READY N/A SUPU-2 Indication that the associated message is issued due to the specified reason.
DUE TO (specified reason uplink) N UM166 DUE TO
TRAFFIC UM167 DUE TO
AIRSPACE
RESTRICTION N/A SUPU-3 Instruction to execute the associated instruction at the aircraft’s best performance rate.
EXPEDITE N Used in combination with LVLU-6, which is implemented in FANS 1/A as:
UM36 EXPEDITE CLIMB TO (altitude).
N/A SUPU-4 Indication that the associated instruction is either a revision to a previously issued instruction or is different from the requested clearance.
REVISED (revision reason[O]) N UM170 ‘REVISED (revision reason[O])’ Note: R response attribute.
N/A SUPU-5 Indication that the associated instruction is to be executed at the earliest point when the pilot is able.
WHEN ABLE N N/A Note: This message element is part of UM75.
N/A F-48