TBL 5-3-17

Free Text Downlink Message Elements (TXTD)
CPDLC Message Sets

Operational Definition in PANS-ATM (Doc 4444)

FANS 1/A

ATN B1

Response

DM68 (free text)
Note 1. - Urgency or Distress
Alr (M)

Message
Element
Identifier

Message Element
Intended Use

TXTD-1

Format for
Message
Element
Display
(free text)
Note - 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.
TBL 5-3-18

System Management Uplink Message Elements (SYSU)
CPDLC Message Sets

Operational Definition in PANS-ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message
Element
Identifier

UM159 ERROR (error
information)

UM159 ERROR
(error
information)

SYSU-1

System-generated
notification of an
error.

ERROR (error
information)

UM160 NEXT DATA
AUTHORITY (ICAO
facility designation)
Note - The facility
designation is required.

UM160 NEXT
DATA
AUTHORITY
(facility)
Note - Facility
parameter can
specify a facility
designation or no
facility.

SYSU-2

System-generated
notification of the
next datuthority
or the cancellation
thereof.

NEXT DATA
AUTHORITY
(facility
designation [O])

En Route Procedures

Message Element
Intended Use

Format for
Message
Element Display

5-3-11