14-2-4
Specific Uplinks
JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov
- Advisory Messages
- Control instructions and messages that require an acknowledgement from the aircraft must not be issued via advisory/free text messages.
- When using abbreviations to compose weather related or advisory/free text messages, comply with FAA Order JO 7340.2, Contractions.
- Speeds
- When using CPDLC to issue a speed assignment to an aircraft at or above FL 390, the WILCO response satisfies the requirement in JO 7110.65, 5-7-2b, regarding pilot concurrence.
- CPDLC must not be used to issue a speed adjustment to an aircraft established on a route or procedure that has published speed restrictions.
- Holding
- CPDLC must not be used to clear an aircraft out of holding.
- If an aircraft has a clearance to climb/descend via, holding instructions must not be issued via CPDLC.
TBL 14-2-1 Response Attribute of CPDLC Message Element Response Attribute Description For Uplink Message W/U Response required.
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.
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.
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 flight crew 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.
Y Response required.
Valid responses: Any CPDLC downlink message, LOGICAL ACKNOWLEDGEMENT (only if required).
N No response required unless logical acknowledgement is required.
Valid Responses (only if LOGICAL ACKNOWLEDGEMENT is required). LOGICAL ACKNOWLEDGEMENT, NOT CURRENT DATA AUTHORITY, NOT AUTHORIZED NEXT DATA AUTHORITY, ERROR
FANS 1/A.— “N” is defined as “no response is required,” but not used. Under some circumstances, an ERROR message will also close an uplink message.
NE [Not defined in Doc 4444]
FANS 1/A.— The WILCO, UNABLE, AFFIRM, NEGATIVE, ROGER, and STANDBY responses are not enabled (NE) for flight crew 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.
For Downlink Message 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, SERVICE UNAVAILABLE, FLIGHT PLAN NOT HELD, 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 Doc 4444. As an example, most emergency messages have an “N” response attribute for FANS 1/A whereas Doc 4444 defines a “Y” response attribute for them. As a consequence, for FANS 1/A aircraft, ATC will need to use alternative means to acknowledge to the flight crew that an emergency message has been received.
TBL 14-2-2 Route Uplink Message Elements FANS 1/A Message Identifier Message Content Response Message element intended use UM74 position W/U Instruction to proceed directly to the specified position. UM75 position
NOTE– This message element is equivalent to SUPU-5 plus RTEU-2 in Doc 4444.
W/U Instruction to proceed directly to the specified position. UM77 AT (position) PROCEED DIRECT TO (position) W/U Instruction to proceed, at the specified position, directly to the next specified position. UM78 AT (altitude) PROCEED DIRECT TO (position) W/U Instruction to proceed directly to the specified position upon reaching the specified altitude. UM79 CLEARED TO (position) VIA (route clearance) W/U Instruction to proceed to the specified position via the specified route. UM80 route clearance W/U Instruction to proceed via the specified route. UM83 AT (position) CLEARED (route clearance) W/U Instruction to proceed from the specified position via the specified route. UM91 HOLD AT (position) MAINTAIN (altitude) INBOUND TRACK (degrees) (direction) TURN LEG TIME (leg type) W/U Instruction to enter a holding pattern at the specified position in accordance with the specified instructions.
NOTE– RTEU-13 EXPECT FURTHER CLEARANCE AT (time) is appended to this message when an extended hold is anticipated.
UM92 HOLD AT (position) AS PUBLISHED MAINTAIN (altitude) W/U 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.
UM93 time W/U Notification that an onwards clearance may be issued at the specified time. UM137 CONFIRM ASSIGNED ROUTE
NOTE– NE response attribute.
Y Request to confirm the assigned route. TBL 14-2-3 Route Downlink Message Elements FANS 1/A Message Identifier Message Content Response Message element intended use DM22 position Y Request for a direct clearance to the specified position. DM23 procedure name Y Request for the specified procedure or clearance name. DM24 route clearance Y Request for the specified route. DM40 route clearance N Confirmation that the assigned route is the specified route. TBL 14-2-4 Lateral Uplink Message Elements FANS 1/A Message Identifier Message Content Response Message element intended use UM82 CLEARED TO DEVIATE UP TO (distance offset) (direction) OF ROUTE W/U Instruction allowing deviation up to the specified distance(s) from the cleared route in the specified direction(s). UM127 REPORT BACK ON ROUTE
NOTE– R response attribute.
W/U Instruction to report when the aircraft is back on the cleared route. TBL 14-2-5 Lateral Downlink Message Elements FANS 1/A Message Identifier Message Content Response Message element intended use DM27 REQUEST WEATHER DEVIATION UP TO (specified distance) (direction) OF ROUTE Y Request for a weather deviation up to the specified distance(s) off track in the specified direction(s). DM41 BACK ON ROUTE N Report indicating that the cleared route has been rejoined. DM59 DIVERTING TO (position) VIA (route clearance)
NOTE 1. – H alert attribute.
NOTE 2. – N response attribute.
N
See Note
Report indicating diverting to the specified position via the specified route, which may be sent without any previous coordination done with ATC. DM60 OFFSETTING (distanceoffset) (direction) OF ROUTE
NOTE 1. – H alert attribute.
NOTE 2. – N response attribute.
N
See Note
Report indicating that the aircraft is offsetting to a parallel track at the specified distance in the specified direction off from the cleared route. DM80 DEVIATING (deviationoffset) (direction) OF ROUTE
NOTE 1. – H alert attribute.
NOTE 2. – N response attribute.
N
See Note
Report indicating deviating specified distance or degrees in the specified direction from the cleared route. TBL 14-2-6 Altitude Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM19 (altitude) W/U Instruction to maintain the specified altitude. UM20 (altitude) W/U Instruction that a climb to the specified altitude is to commence and once reached is to be maintained. UM23 (altitude) W/U Instruction that a descent to the specified altitude is to commence and once reached is to be maintained. UM30 MAINTAIN BLOCK (altitude) TO (altitude) W/U Instruction to maintain the specified vertical range. UM31 CLIMB TO AND MAINTAIN BLOCK (altitude) TO (altitude) W/U Instruction that a climb to the specified vertical range is to commence and once reached is to be maintained. UM32 DESCEND TO AND MAINTAIN BLOCK (altitude) TO (altitude) W/U Instruction that a descent to the specified vertical range is to commence and once reached is to be maintained. UM36 (altitude)
NOTE– This message element is equivalent to SUPU-3 plus LVLU-6 in Doc 4444.
W/U Instruction that a climb to the specified altitude or vertical range is to commence and once reached is to be maintained. UM37 (altitude) W/U Instruction that a descent to the specified altitude or vertical range is to commence and once reached is to be maintained. UM38 (altitude)
NOTE– This message element is equivalent to EMGU-2 plus LVLU-6 in Doc 4444.
W/U Instruction that a climb to the specified altitude or vertical range is to commence and once reached is to be maintained. UM39 (altitude)
NOTE– This message element is equivalent to EMGU-2 plus LVLU-9 in Doc 4444.
W/U Instruction that a descent to the specified altitude or vertical range is to commence and once reached is to be maintained. UM135 CONFIRM ASSIGNED ALTITUDE
NOTE– NE response attribute.
Y Request to confirm the assigned altitude. UM177 AT PILOTS DISCRETION
See Note
NE An instruction used in conjunction with altitude assignments, means that ATC has offered the pilot the option of starting climb or descent whenever they wish and conducting the climb or descent at any rate they wish. The pilot may temporarily level off at any intermediate altitude. However, once the aircraft has vacated an altitude, it may not return to that altitude. TBL 14-2-7 Altitude Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM6 (altitude) Y Request to fly at the specified altitude. DM7 REQUEST BLOCK (altitude) TO (altitude) Y Request to fly at the specified vertical range. DM9 (altitude) Y Request for a climb to the specified level or vertical range. DM10 (altitude) Y Request for a descent to the specified level or vertical range. DM38 (altitude) N Confirmation that the assigned altitude is the specified altitude or vertical range. DM61 DM61 DESCENDING TO (altitude)
NOTE– Urgent alert attribute.
N Report indicating descending to the specified altitude. DM77 DM77 ASSIGNED BLOCK (altitude) TO (altitude) N Confirmation that the assigned vertical range is the specified vertical range. TBL 14-2-8 Crossing Constraint Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM46 CROSS (position) AT (altitude) W/U Instruction that the specified position is to be crossed at the specified altitude. UM49 CROSS (position) AT AND MAINTAIN (altitude)
NOTE– This message element is equivalent to CSTU-1 plus LVLU-5 in Doc 4444.
W/U Instruction that the specified position is to be crossed at the specified altitude. UM51 CROSS (position) AT (time) W/U Instruction that the specified position is to be crossed at the specified time. UM52 CROSS (position) AT OR BEFORE (time) W/U Instruction that the specified position is to be crossed before the specified time. UM53 CROSS (position) AT OR AFTER (time) W/U Instruction that the specified position is to be crossed after the specified time. UM55 CROSS (position) AT (speed) W/U Instruction that the specified position is to be crossed at the specified speed. UM56 CROSS (position) AT OR LESS THAN (speed) W/U Instruction that the specified position is to be crossed at or less than the specified speed. UM57 CROSS (position) AT OR GREATER THAN (speed) W/U Instruction that the specified position is to be crossed at or greater than the specified speed. UM61 CROSS (position) AT AND MAINTAIN (altitude) AT (speed)
NOTE– This message element is equivalent to CSTU-14 plus LVLU-5 in Doc 4444.
W/U Instruction that the specified position is to be crossed at the specified altitude and speed. TBL 14-2-9 Speed Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM106 speed W/U Instruction to maintain the specified speed. UM107 MAINTAIN PRESENT SPEED W/U Instruction to maintain the present speed. UM108 speed W/U Instruction to maintain the specified speed or greater. UM109 speed W/U Instruction to maintain the specified speed or less. UM116 RESUME NORMAL SPEED W/U Instruction to resume a normal speed. The aircraft no longer needs to comply with a previously issued speed restriction. UM134 CONFIRM SPEED
NOTE– NE response attribute.
Y Request to report the speed defined by the speed type(s). TBL 14-2-10 Speed Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM34 speed N Report indicating the speed defined by the specified speed types is the specified speed. TBL 14-2-11 Air Traffic Advisory Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM154 RADAR SERVICES TERMINATED R Advisory that the ATS surveillance service is terminated. TBL 14-2-12 Voice Communications Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM117 CONTACT (ICAO unit name) (frequency) W/U Instruction to establish voice contact with the specified ATS unit on the specified frequency. UM120 MONITOR (ICAO unit name) (frequency) W/U Instruction to monitor the specified ATS unit on the specified frequency. The flight crew is not required to establish voice contact on the frequency. TBL 14-2-13 Voice Communications Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM20 REQUEST VOICE CONTACT
NOTE– Used when a frequency is not required.
Y Request for voice contact on the specified frequency. TBL 14-2-14 Emergency/Urgency Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM38 altitude
Used in combination with LVLU-6 and LVLU-9, which is implemented in FANS 1/A as above
Y Instruction to immediately comply with the associated instruction to avoid imminent situation. UM39 altitude
Used in combination with LVLU-6 and LVLU-9, which is implemented in FANS 1/A as above
Y Instruction to immediately comply with the associated instruction to avoid imminent situation. TBL 14-2-15 Emergency/Urgency Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM55 PAN PAN PAN
NOTE– N response attribute.
Y Indication of an urgent situation. DM56 MAYDAY MAYDAY MAYDAY
NOTE– N response attribute.
Y Indication of an emergency situation. DM57 (remaining fuel) OF FUEL REMAINING AND (remaining souls) SOULS ON BOARD
NOTE– N response attribute
Y Report indicating fuel remaining (time) and number of persons on board. DM58 CANCEL EMERGENCY
NOTE– N response attribute.
Y Indication that the emergency situation is canceled. TBL 14-2-16 Standard Response Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM0 UNABLE N Indication that the message cannot be complied with. UM1 STANDBY N Indication that the message will be responded to shortly. UM3 ROGER N Indication that the message is received. TBL 14-2-17 Standard Response Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM0 WILCO N Indication that the instruction is understood and will be complied with. DM1 UNABLE N Indication that the instruction cannot be complied with. DM2 STANDBY N Indication that the message will be responded to shortly. DM3 ROGER
NOTE– ROGER is the only correct response to an uplink free text message.
N Indication that the message is received. TBL 14-2-18 Supplemental Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM166 DUE TO TRAFFIC N Indication that the associated message is issued due to the specified reason. UM167 DUE TO AIRSPACE RESTRICTION N Indication that the associated message is issued due to the specified reason. TBL 14-2-19 Supplemental Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM65 DUE TO WEATHER N Indication that the associated message is issued due to specified reason. DM66 DUE TO AIRCRAFT PERFORMANCE N Indication that the associated message is issued due to specified reason. TBL 14-2-20 Free Text Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM169 free text R A message or part of a message that does not conform to any standard message element in the PANSATM (Doc 4444). UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note UM169 free text R See Note TBL 14-2-21 Free Text Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM68 free text
NOTE 1. – Urgency or Distress (M alert attribute)
NOTE 2. – Selecting any of the emergency message elements will result in this message element being enabled for the flight crew to include in the emergency message at their discretion.
Y N/A TBL 14-2-22 System Management Uplink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use UM159 error information N System‐generated notification of an error. UM160 ICAO facility designation
NOTE– The facility designation is required.
N System‐generated notification of the next data authority or the cancellation thereof. TBL 14-2-23 System Management Downlink Message Elements FANS 1/A Message Identifier Message Content Response Attribute Message element intended use DM62 error information N System‐generated notification of an error. DM63 NOT CURRENT DATA AUTHORITY N System‐generated rejection of any CPDLC message sent from a ground facility that is not the current data authority. DM64 ICAO facility designation
NOTE– Use by FANS 1/A aircraft in B1 environments.
N System‐generated notification that the ground system is not designated as the next data authority (NDA), indicating the identity of the current data authority (CDA). Identity of the NDA, if any, is also reported.