Appendix F APPENDIX F. CONTRO LLER-PILOT DATA LINK COMMUNICATION (CPDLC)
UPLINK AND DOWNLINK TABLES Table F-1. Color Key Blue Uplink Tables Green Downlink Tables Table F-2. Response Attribute of CPDLC Message Element for Uplink Messages Response Attribute Description W/U Response required. Yes Valid responses. WILCO, UNABLE, STANDBY, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY, LOGICAL ACKNOWLEDGEMENT (only if required), ERROR Note: WILCO, UNABLE, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY and ERROR will close the uplink message.
FANS 1/A: WILCO, UNABLE, STANDBY, ERROR, NOT CURRENT DATA AUTHORITY.
A/N Response required. Yes Valid responses. AFFIRM, NEGATIVE, STANDBY, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY, LOGICAL ACKNOWLEDGEMENT (only if required), ERROR Note: AFFIRM, NEGATIVE, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY and ERROR will close the uplink message.
FANS 1/A: AFFIRM, NEGATIVE, STANDBY, ERROR, NOT CURRENT DATA AUTHORITY.
R Response required. Yes Valid responses. ROGER, UNABLE, STANDBY, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY, LOGICAL ACKNOWLEDGEMENT (only if required), ERROR Note: ROGER, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY and ERROR will close the uplink message.
FANS 1/A: ROGER, STANDBY, ERROR, NOT CURRENT DATA AUTHORITY. FANS 1/A aircraft do not have the capability to send UNABLE in response to an uplink message containing message elements with an “R” response attribute. For these aircraft, the pilot may use alternative means to UNABLE the message. These alternative means will need to be taken into consideration to ensure proper technical and operational closure of the communication transaction.
F-1
Appendix F Response Attribute Description Y Response required. Yes Valid responses: Any CPDLC downlink message, LOGICAL ACKNOWLEDGEMENT (only if required) N Response required. No, unless logical acknowledgement required.
Valid Responses (only if LOGICAL ACKNOWLEDGEMENT is required). LOGICAL
ACKNOWLEDGEMENT, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT
DATA AUTHORITY, ERROR FANS 1/A: Defined “Response not required,” but not used. Under some circumstances, an ERROR message will also close an uplink message.
NE [Not defined in International Civil Aviation Organization (ICAO) Doc 4444] FANS 1/A: The WILCO, UNABLE, AFFIRM, NEGATIVE, ROGER, and STANDBY responses are not enabled (NE) for pilot selection. An uplink message with a response attribute NE is considered to be closed even though a response may be required operationally. Under some circumstances, a downlink error message may be linked to an uplink message with a NE attribute.
Table F-3. Response Attribute of CPDLC Message Element for Downlink Messages Response Attribute Description Y Response required. Yes Valid responses: Any CPDLC uplink message, LOGICAL ACKNOWLEDGEMENT (only if required).
N Response required. No, unless logical acknowledgement required.
Valid responses (only if LOGICAL ACKNOWLEDGEMENT is required). LOGICAL
ACKNOWLEDGEMENT, MESSAGE NOT SUPPORTED BY THIS ATC UNIT, ERROR FANS 1/A: Aircraft do not have the capability to receive technical responses to downlink message elements with an “N” response attribute (other than LACK or ERROR for ATN B1 aircraft).
In some cases, the response attribute is different between FANS 1/A aircraft and ICAO Doc 4444.
As an example, most emergency messages have an “N” response attribute for FANS 1/A whereas ICAO Doc 4444 defines a “Y” response attribute for them. As a consequence, for FANS 1/A aircraft, the ATC will need to use alternative means to acknowledge to the pilot that an emergency message has been received.
F-2
Appendix F Table F-4. Route Uplink Message Elements (RTEU) 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 RTEU-1 Instruction to proceed via the specified departure clearance.
(departure clearance) W/U UM169 (free text) Note: UM169 may be combined with UM158 ATIS (ATIS code) and/or UM123 SQUAWK (beacon) code) and/or UM19 MAINTAIN (altitude).
N/A RTEU-2 Instruction to proceed directly to the specified position.
PROCEED DIRECT TO ( position) W/U UM 74 PROCEED DIRECT TO (position) UM74 PROCEED
DIRECT TO (position) RTEU-2 Instruction to proceed directly to the specified position.
PROCEED DIRECT TO ( position) W/U UM 75 WHEN ABLE
PROCEED DIRECT TO (position) Note: This message element is equivalent to SUPU-5 plus RTEU-2 in ICAO Doc 4444.
N/A RTEU-3 Instruction to proceed, at the specified time, directly to the specified position.
AT TIME (time) PROCEED DIRECT TO (position) W/U UM76 AT (time)
PROCEED DIRECT TO (position) N/A RTEU-4 Instruction to proceed, at the specified position, directly to the next specified position.
AT (position) PROCEED DIRECT TO (position) W/U UM77 AT (position)
PROCEED DIRECT TO (position) N/A RTEU-5 Instruction to proceed upon reaching the specified level, directly to the specified position.
AT (level single) PROCEED DIRECT TO (position) W/U UM78 AT (altitude)
PROCEED DIRECT TO (position) N/A F-3
Appendix F Operational Definition in PANS-ATM (Doc 4444) CP DLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 RTEU-6 Instruction to proceed to the specified position via the specified route.
CLEARED TO (position) VIA (departure data[O]) (en-route data) W/U UM79 CLEARED TO (position) VIA (route clearance) UM79 CLEARED TO (position) VIA (route clearance) RTEU-7 Instruction to proceed via the specified route.
CLEARED (departure data[O]) (en-route data) (arrival approach data) W/U UM80 CLEARED (route clearance) UM80 CLEARED (route clearance) RTEU-8 Instruction to proceed in accordance with the specified procedure.
CLEARED (procedure name) W /U UM81 CLEARED (procedure name) N/A RTEU-9 Instruction to proceed from the specified position via the specified route.
AT (position) CLEARED (en-route data) (arrival approach data) W/U UM83 AT (position)
CLEARED (route clearance) N/A RTEU-10 Instruction to proceed from the specified position via the specified procedure.
AT (position) CLEARED (procedure name) W/U UM84 AT (position) CLEARED (procedure name) N/A RTEU-11 Instruction to enter a holding pattern at the specified position in accordance with the specified instructions.
Note: RTEU-13 EXPECT
FURTHER CLEARANCE AT TIME (time) is appended to this message when an extended hold is anticipated.
AT (position) HOLD
INBOUND TRACK (degrees)(direction) TURNS (leg type) LEGS W/U UM91 HOLD AT (position) MAINTAIN (altitude) INBOUND TRACK (degrees) (direction) TURN LEG TIME (leg type) N/A F-4
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 RTEU-12 Instruction to enter a holding pattern at the specified position in accordance with the published holding instructions.
Note: RTEU-13 EXPECT
FURTHER CLEARANCE AT TIME (time) is appended to this message when an extended hold is anticipated.
AT (position) HOLD AS
PUBLISHED W/U UM92 HOLD AT (position)
AS PUBLISHED MAINTAIN (altitude) UM92 HOLD AT (position) AS
PUBLISHED MAINTAIN (level) RTEU-13 Notification that an onwards clearance may be issued at the specified time.
EXPECT FURTHER
CLEARANCE AT TIME (time) R UM93 EXPECT
FURTHER
CLEARANCE AT (time) N/A RTEU-14 Notification that a clearance may be issued for the aircraft to fly the specified procedure or clearance name.
EXPECT (named instruction) R UM99 EXPECT (procedure name) Note: Used when a published procedure is designated.
UM169 ‘EXPECT (clearance name)’ Note: Used when an unpublished clearance/procedure name is designated.
N/A RTEU-15 Request to confirm the assigned route.
CONFIRM ASSIGNED ROUTE Y UM137 CONFIRM
ASSIGNED ROUTE Note: NE response attribute.
N/A F-5
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 RTEU-16 Request to make a position report.
REQUEST POSITION REPORT Y UM147 REQUEST
POSITION REPORT N/A RTEU-17 Request to provide the estimated time of arrival at the specified position.
ADVISE ETA (position) Y UM169 ‘ADVISE ETA (position)’ N/A F-6
Appendix F Table F-5. Route Downlink Message Elements (RTED) 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 RTED-1 Request for a direct clearance to the specified position.
REQUEST DIRECT TO (position) Y DM22 REQUEST DIRECT TO (position) DM22 REQUEST
DIRECT TO (position) RTED-2 Request for the specified procedure or clearance name.
REQUEST (named instruction) Y DM23 REQUEST (procedure name) N/A RTED-3 Request for the specified route. REQUEST CLEARANCE (departure data[O]) (en-route data) (arrival approach data[O]) Y DM24 REQUEST (route clearance) N/A RTED-4 Request for the specified clearance.
REQUEST (clearance type)
CLEARANCE Y DM25 REQUEST
CLEARANCE N/A RTED-5 Position report. POSITION REPORT (position report) N DM48 POSITION REPORT (position report) N/A RTED-6 Request for the specified heading.
REQUEST HEADING (degrees) Y DM70 REQUEST HEADING (degrees) N/A RTED-7 Request for the specified ground track.
REQUEST GROUND TRACK (degrees) Y DM71 REQUEST
GROUND TRACK (degrees) N/A RTED-8 Request for the time or position that can be expected to rejoin the cleared route.
WHEN CAN WE EXPECT
BACK ON ROUTE Y DM51 WHEN CAN
WE EXPECT BACK
ON ROUTE N/A RTED-9 Confirmation that the assigned route is the specified route.
ASSIGNED ROUTE (departure data[O]) (en-route data) (arrival approach data[O]) N DM40 ASSIGNED ROUTE (route clearance) N/A RTED-10 Notification of estimated time of arrival at the specified position.
ETA (position) TIME (time) N DM67 ‘ETA (position) TIME (time)’ N/A F-7
Appendix F Table F-6. Lateral Uplink Message Elements (LATU) 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 LATU-1 Instruction to fly a parallel track to the cleared route at a displacement of the specified distance in the specified direction.
OFFSET (specified distance) (direction) OF ROUTE W/U UM64 OFFSET (distance offset) (direction)
OF ROUTE UM64 OFFSET (specified distance) (direction)
OF ROUTE LATU-2 Instruction to fly a parallel track to the cleared route at a displacement of the specified distance in the specified direction and commencing at the specified position.
AT (position) OFFSET (specified distance) (direction) OF ROUTE W/U UM65 AT (position) OFFSET (distance offset) (direction)
OF ROUTE N/A LATU-3 Instruction to fly a parallel track to the cleared route at a displacement of the specified distance in the specified direction and commencing at the specified time.
AT TIME (time) OFFSET (specified distance) (direction) OF ROUTE W/U UM66 AT (time) OFFSET (distance offset) (direction) OF ROUTE N/A LATU-4 Instruction to rejoin the cleared route.
REJOIN ROUTE W/U UM67 PROCEED
BACK ON ROUTE N/A LATU-5 Instruction to rejoin the cleared route before passing the specified position.
REJOIN ROUTE BEFORE PASSING (position) W/U UM68 REJOIN ROUTE BY (position) N/A LATU-6 Instruction to rejoin the cleared route before the specified time.
REJOIN ROUTE BEFORE TIME (time) W/U UM69 REJOIN ROUTE BY (time) N/A LATU-7 Notification that a clearance may be issued to enable the aircraft to rejoin the cleared route before passing the specified position.
EXPECT BACK ON ROUTE BEFORE PASSING (position) R UM70 EXPECT
BACK ON ROUTE BY (position) N/A F-8
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 LATU-8 Notification a clearance may be issued to enable the aircraft to rejoin the cleared route before the specified time.
EXPECT BACK ON ROUTE BEFORE TIME (time) R UM71 EXPECT
BACK ON ROUTE BY (time) N/A LATU-9 Instruction to resume own navigation following a period of tracking or heading clearances.
May be used in conjunction with an instruction on how or where to rejoin the cleared route.
RESUME OWN
NAVIGATION W/U UM72 RESUME
OWN NAVIGATION UM72 RESUME
OWN NAVIGATION LATU-10 Instruction allowing deviation up to the specified distance(s) from the cleared route in the specified direction(s).
CLEARED TO DEVIATE UP TO (lateral deviation)
OF ROUTE W/U UM82 CLEARED TO
DEVIATE UP TO (distance offset) (direction)
OF ROUTE UM82 CLEARED TO
DEVIATE UP TO (specified distance) (direction)
OF ROUTE LATU-11 Instruction to turn left or right as specified on to the specified heading.
TURN (direction) HEADING (degrees) W/U UM94 TURN (direction) HEADING (degrees) UM94 TURN (direction) HEADING (degrees) LATU-11 Instruction to turn left or right as specified on to the specified heading.
TURN (direction) HEADING (degrees) W/U UM98
IMMEDIATELY TURN (direction) HEADING (degrees) Note: This message element is equivalent to EMGU-2 plus LATU-11 in ICAO Doc 4444.
N/A LATU-12 Instruction to turn left or right as specified on to the specified track.
TURN (direction) GROUND TRACK (degrees) W/U UM95 TURN (direction)
GROUND TRACK (degrees) N/A F-9
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 LATU-13 Instruction to turn the specified number of degrees left or right.
TURN (direction) (number of degrees) DEGREES W/U N/A UM215 TURN (direction) (degrees) LATU-14 Instruction to continue to fly the present heading.
CONTINUE PRESENT
HEADING W/U UM96 FLY PRESENT
HEADING UM96 CONTINUE
PRESENT HEADING LATU-15 Instruction to fly the specified heading upon reaching the specified position.
AT (position) FLY HEADING (degrees) W/U UM97 AT (position)
FLY HEADING (degrees) N/A LATU-16 Instruction to fly the specified heading.
FLY HEADING (degrees) W/U N/A UM190 FLY HEADING (degrees) LATU-17 Instruction to report when clear of weather.
REPORT CLEAR OF
WEATHER W/U UM169 ‘REPORT
CLEAR OF WEATHER’ Note: R response attribute.
N/A LATU-18 Instruction to report when the aircraft is back on the cleared route.
REPORT BACK ON ROUTE W/U UM127 REPORT
BACK ON ROUTE Note: R response attribute.
N/A LATU-19 Instruction to report upon passing the specified position.
REPORT PASSING (position) W/U UM130 REPORT PASSING (position) Note: R response attribute.
N/A F-10
Appendix F Table F-7. Lateral Downlink Message Elements (LATD) Operational Definition in PANS-ATM (Doc 4444) C PDLC Message Sets Message Element Identifier Message Element Intended Use Format for Message Element Display Resp. FANS 1/A ATN B1 LATD-1 Request for a parallel track from the cleared route at a displacement of the specified distance in the specified direction.
REQUEST OFFSET (specified distance) (direction)
OF ROUTE Y DM15 REQUEST OFFSET (specified distance) (direction)
OF ROUTE N/A LATD-2 Request for a weather deviation up to the specified distance(s) off track in the specified direction(s).
REQUEST WEATHER
DEVIATION UP TO (lateral deviation) OF ROUTE Y DM27 REQUEST
WEATHER
DEVIATION UP TO (specified distance) (direction)
OF ROUTE DM27 REQUEST
WEATHER
DEVIATION UP TO (specified distance) (direction)
OF ROUTE LATD-3 Report indicating that the aircraft is clear of weather.
CLEAR OF WEATHER N DM69 ‘CLEAR OF WEATHER’ N/A LATD-4 Report indicating that the cleared route has been rejoined.
BACK ON ROUTE N DM41 BACK ON ROUTE N/A LATD-5 Report indicating diverting to the specified position via the specified route, which may be sent without any previous coordination done with ATC.
DIVERTING TO (position) VIA (en-route data) (arrival approach data[O]) Y DM59 DIVERTING TO (position) VIA (route clearance) Note 1: H alert attribute.
Note 2: N response attribute.
N/A LATD-6 Report indicating that the aircraft is offsetting to a parallel track at the specified distance in the specified direction off from the cleared route.
OFFSETTING (specified distance) (direction) OF ROUTE Y DM60 OFFSETTING (distance offset) (direction)
OF ROUTE Note 1: H alert attribute.
Note 2: N response attribute.
N/A F-11
Appendix F Operational Definition in PANS-ATM (Doc 4444) C PDLC Message Sets Message Element Identifier M essage Element Intended Use Format for Message Element Display R esp. FANS 1/A ATN B1 LATD-7 Report indicating deviating specified distance or degrees in the specified direction from the cleared route.
DEVIATING (Specified Deviation) (direction) OF ROUTE Y DM80 DEVIATING (Deviation Offset) (direction) OF ROUTE Note 1: H alert attribute.
Note 2: N response attribute.
N/ A LATD-8 Report indicating passing the specified position.
PASSING (position) N DM31 PASSING (position) N/ A F-12