AIM 

4/20/23

 

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En Route Procedures

TBL 5

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19

System Management Downlink Message Elements (SYSD)

CPDLC Message Sets

Operational Definition in PANS

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ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message
Element

Identifier

Message Element

Intended Use

Format for

Message

Element Display

DM62 ERROR 

(error

information)

DM62 ERROR

(error
information)

N

SYSD

−

1

System

−

generated

notification of an
error.

SYSD

−

1

DM63 NOT
CURRENT DATA
AUTHORITY

DM63 NOT
CURRENT
DATA
AUTHORITY

N

SYSD

−

3

System

−

generated

rejection of any
CPDLC message
sent from a ground
facility that is not
the current data
authority.

SYSD

−

3

DM64 

(ICAO facility

designation)
Note 

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 Use by FANS

1/A aircraft in B1
environments.

DM107 NOT
AUTHORIZED
NEXT DATA
AUTHORITY

Note 

−

 CDA and

NDA cannot be
provided.

N

SYSD

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5

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.

SYSD

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5

2.

The following phraseology should be utilized by pilots for establishing contact with the designated

facility:

(a)

When operating in a radar environment: On initial contact, the pilot should inform the controller of

the aircraft’s assigned altitude preceded by the words “level,” or “climbing to,” or “descending to,” as
appropriate; and the aircraft’s present vacating altitude, if applicable.

EXAMPLE

−

1.

(Name) CENTER, (aircraft identification), LEVEL (altitude or flight level)

.

2.

(Name) CENTER, (aircraft identification), LEAVING (exact altitude or flight level), CLIMBING TO OR DESCENDING

TO (altitude of flight level)

.

NOTE

−

Exact altitude or flight level means to the nearest 100 foot increment. Exact altitude or flight level reports on initial contact
provide ATC with information required prior to using Mode C altitude information for separation purposes.

(b)

When operating in a nonradar environment:

(1)

On initial contact, the pilot should inform the controller of the aircraft’s present position, altitude

and time estimate for the next reporting point.

EXAMPLE

−

(

Name) CENTER, (aircraft identification), (position), (altitude), ESTIMATING (reporting point) AT (time)

.

(2)

After initial contact, when a position report will be made, the pilot should give the controller a

complete position report.

EXAMPLE

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(

Name) CENTER, (aircraft identification), (position), (time), (altitude), (type of flight plan), (ETA and name of next

reporting point), (the name of the next succeeding reporting point), AND (remarks)

.