User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 116 of 173
Section
ID
CPDLC DM/Example
Message Intent
PANS/GOLD
3.5.2.1 106
PREFERRED LEVEL [level]
PREFERRED LEVEL 25000FT
Notification of the preferred level.
-- 107
NOT AUTHORIZED NEXT
DATA AUTHORITY
A system-generated downlink
message sent to a ground station
that tries to connect to an aircraft
when the current data authority has
not designated that station as the
NDA.
Response to
an ADVISE
TOP OF
DESCENT
segment of
an uplink
109
TOP OF DESCENT [time]
TOP OF DESCENT 1237
Notification of the preferred time to
commence descent for approach.
110
TOP OF DESCENT [position]
TOP OF DESCENT XYZ
Notification of the preferred
position to commence descent for
approach.
111
TOP OF DESCENT [time]
[position]
TOP OF DESCENT 1200 XYZ
Notification of the preferred time
and position to commence descent
for approach.
111