User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 40 of 173
ATC ALT REQ
Use this page to construct an altitude request. Access to this page requires an active CPDLC
session.
Figure 3-7 ATC ALT REQ
Envoy formats a request and prompts aircrew to VERIFY the request prior to sending the downlink.
Table 3-5 ATC ALT REQ Fields
LSK
Label
Short Description
L1
ALTITUDE
Required. Acceptable input:
• Flight level: FL350 or block level (FL350/FL370) or 3 numeric characters
between 030 and 600, in 100 ft. increments
• Altitude: 4 or 5 numeric characters between 0000 and 70000 in 100 ft increments
• Altitude: 4 or 5 numeric characters between 0000 and 25000 followed by M for 1
meter increments
L3
STEP AT POS OR
TIME
Optional. FANS only (not available in ATN)
• POS format: BALIX (Waypoint ID) for additional POS formats, see Section 2.2.8
• TIME format: 0220z
R1
DUE TO
Optional. Selection list:
• <blank> (default)
• WEATHER
• PERF
R6
SEND
When required data is entered, VERIFY prompt appears.
After verification, add optional free text to justify the request.