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level.
Table A5-15. Lateral offset requests (downlink)
Table A5-16. Speed requests (downlink)
Table A5-17. Voice contact requests (downlink)
12 Request that at the specified position
a descent to the specified level be
approved.
AT (position) REQUEST
DESCENT TO (level)
N L Y
13 Request that at the specified time a
climb to the specified level be
approved.
AT (time) REQUEST CLIMB
TO (level)
N L Y
14 Request that at the specified time a
descent to the specified level be
approved.
AT (time) REQUEST
DESCENT TO (level)
N L Y
69 Request that a descent be approved
on a see-and-avoid basis.
REQUEST VMC DESCENT N L Y
Message intent/use Message element URG ALRT RESP
15 Request that a parallel track, offset
from the cleared track by the
specified distance in the specified
direction, be approved.
REQUEST OFFSET
(specified distance)
(direction) OF ROUTE
N L Y
16 Request that a parallel track, offset
from the cleared track by the
specified distance in the specified
direction, be approved from the
specified position.
AT (position) REQUEST
OFFSET (specified distance)
(direction) OF ROUTE
N L Y
17 Request that a parallel track, offset
from the cleared track by the
specified distance in the specified
direction, be approved from the
specified time.
AT (time) REQUEST
OFFSET (specified distance)
(direction) OF ROUTE
N L Y
Message intent/use Message element URG ALRT RESP
18 Request to fly at the specified speed. REQUEST (speed) N L Y
19 Request to fly within the specified
speed range.
REQUEST (speed) TO
(speed)
N L Y
Message intent/use Message element URG ALRT RESP
20 Request for voice contact. REQUEST VOICE
CONTACT
N L Y
21 Request for voice contact on the
specified frequency.
REQUEST VOICE
CONTACT (frequency)
N L Y
Message intent/use Message element URG ALRT RESP
A5-20 Air Traffic Management (PANS-ATM)
1/11/01
Table A5-18. Route modification requests (downlink)
Table A5-19. Reports (downlink)
Message intent/use Message element URG ALRT RESP
22 Request to track from the present
position direct to the specified
position.
REQUEST DIRECT TO
(position)
N L Y
23 Request for the specified procedure
clearance.
REQUEST (procedure name) N L Y
24 Request for a route clearance. REQUEST CLEARANCE
(route clearance)
N L Y
25 Request for a clearance. REQUEST (clearance type)
CLEARANCE
N L Y
26 Request for a weather deviation to
the specified position via the
specified route.
REQUEST WEATHER
DEVIATION TO (position)
VIA (route clearance)
N M Y
27 Request for a weather deviation up to
the specified distance off track in the
specified direction.
REQUEST WEATHER
DEVIATION UP TO
(specified distance)
(direction) OF ROUTE
N M Y
70 Request a clearance to adopt the
specified heading.
REQUEST HEADING
(degrees)
N L Y
71 Request a clearance to adopt the
specified ground track.
REQUEST GROUND
TRACK (degrees)
N L Y
Message intent/use Message element URG ALRT RESP
28 Notification of leaving the specified
level.
LEAVING (level) N L N
29 Notification of climbing to the
specified level.
CLIMBING TO (level) N L N
30 Notification of descending to the
specified level.
DESCENDING TO (level) N L N
31 Notification of passing the specified
position.
PASSING (position) N L N
78 Notification that at the specified time
the aircraft’s position was as
specified.
AT (time) (distance) (to/from)
(position)
N L N
32 Notification of the present level. PRESENT LEVEL (level) N L N
33 Notification of the present position. PRESENT POSITION
(position)
N L N
34 Notification of the present speed. PRESENT SPEED (speed) N L N
113 Notification of the requested speed. (speed type) (speed type)
(speed type) SPEED (speed)
N L N
35 Notification of the present heading in
degrees.
PRESENT HEADING
(degrees)
N L N
Appendix 5 A5-21
1/11/01
36 Notification of the present ground
track in degrees.
PRESENT GROUND
TRACK (degrees)
N L N
37 Notification that the aircraft is
maintaining the specified level.
MAINTAINING (level) N L N
72 Notification that the aircraft has
reached the specified level.
REACHING (level) N L N
76 Notification that the aircraft has
　
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