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
Appendix F Table F-8. Level Uplink Message Elements (LVLU) 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 LVLU-1 Notification that an instruction may be expected for the aircraft to commence climb at the specified time.
EXPECT HIGHER AT TIME (time) R UM7 EXPECT CLIMB AT (time) N/A LVLU-2 Notification that an instruction may be expected for the aircraft to commence climb at the specified position.
EXPECT HIGHER AT (position) R UM8 EXPECT CLIMB AT (position) N/A LVLU-3 Notification that an instruction may be expected for the aircraft to commence descent at the specified time.
EXPECT LOWER AT TIME (time) R UM9 EXPECT DESCENT AT (time) N/A LVLU-4 Notification that an instruction may be expected for the aircraft to commence descent at the specified position.
EXPECT LOWER AT (position) R UM10 EXPECT
DESCENT AT (position) N/A LVLU-5 Instruction to maintain the specified level or vertical range.
MAINTAIN (level) W/U UM19 MAINTAIN (altitude) Note: Used for a single level.
UM30 MAINTAIN BLOCK (altitude) TO (altitude) Note: Used for a vertical range.
UM19 MAINTAIN (level) F-13
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 LVLU-6 Instruction that a climb to the specified level or vertical range is to commence and once reached is to be maintained.
CLIMB TO (level) W/U UM20 CLIMB TO
AND MAINTAIN (altitude) Note: Used for a single level.
UM31 CLIMB TO
AND MAINTAIN BLOCK (altitude) TO (altitude) Note: Used for a vertical range.
UM20 CLIMB TO (level) LVLU-6 Instruction that a climb to the specified level or vertical range is to commence and once reached is to be maintained.
CLIMB TO (level) W/U UM36 EXPEDITE CLIMB TO (altitude) Note: This message element is equivalent to SUPU-3 plus LVLU-6 in ICAO Doc 4444.
UM38
IMMEDIATELY CLIMB TO (altitude) Note: This message element is equivalent to EMGU-2 plus LVLU-6 in ICAO Doc 4444.
N/A F-14
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 LVLU-7 Instruction that at the specified time a climb to the specified level or vertical range is to commence and once reached is to be maintained.
Note: This message element would be preceded with LVLU-5 MAINTAIN (level), to prevent the premature execution of the instruction.
AT TIME (time) CLIMB TO (level) W/U UM21 AT (time)
CLIMB TO AND MAINTAIN (altitude) Note: A vertical range cannot be provided.
N/A LVLU-8 Instruction that at the specified position a climb to the specified level or vertical range is to commence and once reached is to be maintained.
Note: This message element would be preceded with LVLU-5 MAINTAIN (level), to prevent the premature execution of the instruction.
AT (position) CLIMB TO (level) W/U UM22 AT (position)
CLIMB TO AND MAINTAIN (altitude) Note: A vertical range cannot be provided.
N/A LVLU-9 Instruction that a descent to the specified level or vertical range is to commence and once reached is to be maintained.
DESCEND TO (level) W/U UM23 DESCEND TO
AND MAINTAIN (altitude) Note: Used for a single level.
UM23 DESCEND TO (level) F-15
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 LVLU-9 Instruction that a descent to the specified level or vertical range is to commence and once reached is to be maintained.
DESCEND TO (level) W/U UM32 DESCEND TO
AND MAINTAIN BLOCK (altitude) TO (altitude) Note: Used for a vertical range.
UM39
IMMEDIATELY
DESCEND TO (altitude) Note: This message element is equivalent to EMGU-2 plus.
N/A LVLU-10 Instruction that at the specified time a descent to the specified level or vertical range is to commence and once reached is to be maintained.
AT TIME (time) DESCEND TO (level) W/U UM24 AT (time)
DESCEND TO AND MAINTAIN (altitude) Note: A vertical range cannot be provided.
N/A LVLU-11 Instruction that at the specified position a descent to the specified level or vertical range is to commence and once reached is to be maintained.
AT (position) DESCEND TO (level) W/U UM25 AT (position)
DESCEND TO AND MAINTAIN (altitude) Note: A vertical range cannot be provided.
N/A LVLU-12 Instruction that a climb is to be completed such that the specified level is reached before the specified time.
CLIMB TO REACH (level single) BEFORE TIME (time) W/U UM26 CLIMB TO REACH (altitude) BY (time) UM26 CLIMB TO REACH (level) BY (time) LVLU-13 Instruction that a climb is to be completed such that the specified level is reached before passing the specified position.
CLIMB TO REACH (level single) BEFORE PASSING (position) W/U UM27 CLIMB TO REACH (altitude) BY (position) UM27 CLIMB TO REACH (level) BY (position) F-16
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 LVLU-14 Instruction that a descent is to be completed such that the specified level is reached before the specified time.
DESCEND TO REACH (level single) BEFORE TIME (time) W/U UM28 DESCEND TO REACH (altitude) BY (time) UM28 DESCEND TO REACH (level) BY (time) LVLU-15 Instruction that a descent is to be completed such that the specified level is reached before passing the specified position.
DESCEND TO REACH (level single) BEFORE PASSING (position) W/U UM29 DESCEND TO REACH (altitude) BY (position) UM29 DESCEND TO REACH (level) BY (position) LVLU-16 Instruction to stop the climb at the specified level and, once reached, this level is to be maintained. The specified level will be below the previously assigned level. This instruction should only be issued when the controller can confirm that the previously assigned level has not yet been reached.
STOP CLIMB AT (level single) W/U UM169 ‘STOP CLIMB AT (altitude)’ Note: R response attribute.
N/A LVLU-17 Instruction to stop the descent at the specified level and, once reached, this level is to be maintained. The specified level will be above the previously assigned level. This instruction should only be issued when the controller can confirm that the previously assigned level has not yet been reached.
STOP DESCENT AT (level single) W/U UM169 ‘STOP
DESCENT AT (altitude)’ Note: R response attribute.
N/A LVLU-18 Instruction to climb at the specified rate or greater.
CLIMB AT (vertical rate) OR
GREATER W/U UM171 CLIMB AT (vertical rate)
MINIMUM UM171 CLIMB AT (vertical rate)
MINIMUM F-17
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 LVLU-19 Instruction to climb at the specified rate or less.
CLIMB AT (vertical rate) OR LESS W/U UM172 CLIMB AT (vertical rate)
MAXIMUM UM172 CLIMB AT (vertical rate)
MAXIMUM LVLU-20 Instruction to descend at the specified rate or greater.
DESCEND AT (vertical rate)
OR GREATER W/U UM173 DESCEND AT (vertical rate)
MINIMUM UM173 DESCEND AT (vertical rate)
MINIMUM LVLU-21 Instruction to descend at the specified rate or less.
DESCEND AT (vertical rate)
OR LESS W/U UM174 DESCEND AT (vertical rate)
MAXIMUM UM174 DESCEND AT (vertical rate)
MAXIMUM LVLU-22 Notification that a clearance may be issued for the aircraft to commence a climb to the specified level at the specified number of minutes after departure.
EXPECT (level single) (number of minutes) AFTER
DEPARTURE R UM169 ‘EXPECT (level single) (number of minutes) AFTER DEPARTURE’ N/A LVLU-23 Instruction to report upon leaving the specified level.
REPORT LEAVING (level single) W/U UM128 REPORT LEAVING (altitude) Note: R response attribute.
N/A LVLU-24 Instruction to report upon maintaining the specified level.
REPORT MAINTAINING (level single) W/U UM129 REPORT LEVEL (altitude) Note: R response attribute.
N/A LVLU-25 Instruction to report the present level.
REPORT PRESENT LEVEL Y N/A Note: Refer to A.6.
UM133 REPORT
PRESENT LEVEL LVLU-26 Instruction to report upon reaching the specified vertical range.
REPORT REACHING BLOCK (level single) TO (level single) W/U UM180 REACHING BLOCK (altitude) TO (altitude) Note: R response attribute.
N/A F-18
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 LVLU-27 Request to confirm the assigned level.
CONFIRM ASSIGNED LEVEL Y UM135 CONFIRM
ASSIGNED
ALTITUDE Note: NE response attribute.
N/A LVLU-28 Request to provide the preferred level.
ADVISE PREFERRED LEVEL Y UM169 ‘ADVISE
PREFERRED LEVEL’ Note: R response attribute.
UM231 STATE
PREFERRED LEVEL LVLU-29 Request to provide the preferred time and/or position to commence descent to the aerodrome of intended arrival.
ADVISE TOP OF DESCENT Y UM169 ‘ADVISE TOP OF DESCENT’ Note: R response attribute.
UM232 STATE TOP
OF DESCENT LVLU-30 Request for the earliest time or position when the specified level can be accepted.
WHEN CAN YOU ACCEPT (level single) Y UM148 WHEN CAN
YOU ACCEPT (altitude) Note: NE response attribute.
UM148 WHEN CAN YOU ACCEPT (level) LVLU-31 Request to indicate whether or not the specified level can be accepted at the specified position.
CAN YOU ACCEPT (level single) AT (position) A/N UM149 CAN YOU ACCEPT (altitude) AT (position) N/A LVLU-32 Request to indicate whether or not the specified level can be accepted at the specified time.
CAN YOU ACCEPT (level single) AT TIME (time) A/N UM150 CAN YOU ACCEPT (altitude) AT (time) N/A LVLU-33 Instruction to expedite a descent to the specified level is to commence and once reached the specified level is to be maintained.
EXPEDITE DESCENT TO (level single) W/U UM37 EXPEDITE
DESCENT TO (altitude) N/A F-19