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TBL 5

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Crossing Constraint Message Elements (CSTU)

CPDLC Message Sets

Operational Definition in PANS

-

ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message

Element

Identifier

Message Element

Intended Use

Format for

Message Element

Display

UM49 CROSS

(

position

) AT AND

MAINTAIN (

altitude

)

Note 1.

-

 A vertical

range cannot be

provided.

Note 2.

-

 This

message element is

equivalent to CSTU

-

plus LVLU

-

5 in

Doc 4444.

W/U

CSTU

-

Instruction that the

specified position

is to be crossed at

the specified level

or within the

specified vertical

range.

CROSS

(position)

AT

(level)

UM61 CROSS

(position)

AT AND

MAINTAIN

(altitude)

AT

(speed)

Note 1.

-

 A vertical

range cannot be

provided.

Note 2.

-

 This

message element is

equivalent to

CSTU

-

14 plus

LVLU

-

5 in Doc 4444.

UM61 CROSS

(position)

AT AND

MAINTAIN

(level)

AT

(speed)

W/U

CSTU

-

Instruction that the

specified position

is to be crossed at

the level or within

the vertical range,

as specified, and at

the specified

speed.

CROSS

(position)

AT

(level)

 AT

(speed)

TBL 5

-

-

Air Traffic Advisory Uplink Message Elements

CPDLC Message Sets

Operational Definition in PANS

-

ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message

Element

Identifier

Message Element

Intended Use

Format for

Message Element

Display

UM154 RADAR

SERVICES

TERMINATED

ADVU

-

Advisory that the

ATS surveillance

service is

terminated.

SURVEILLANCE

SERVICE

TERMINATED

En Route Procedures

-

-