AIM
6/17/21
TBL 5
−
3
−
6
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 (
posi-
tion
) AT AND MAIN-
TAIN (
altitude
)
Note 1.
−
A vertical
range cannot be pro-
vided.
Note 2.
−
This mes-
sage element is equiv-
alent to CSTU
−
1 plus
LVLU
−
5 in Doc 4444.
N/A
W/U
CSTU
−
1
Instruction that the
specified position
is to be crossed at
the specified level
or within the speci-
fied vertical range.
CROSS
(position)
AT
(level)
UM61 CROSS
(posi-
tion)
AT AND MAIN-
TAIN
(altitude)
AT
(speed)
Note 1.
−
A vertical
range cannot be pro-
vided.
Note 2.
−
This mes-
sage element is equiv-
alent to CSTU
−
14 plus
LVLU
−
5 in Doc 4444.
UM61 CROSS
(position)
AT AND
MAINTAIN
(level)
AT
(speed)
W/U
CSTU
−
14
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
−
3
−
7
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 TERMI-
NATED
N/A
R
ADVU
−
2
Advisory that the
ATS surveillance
service is terminat-
ed.
SURVEILLANCE
SERVICE TERMI-
NATED
En Route Procedures
5
−
3
−
6