User's Guide
Table Of Contents
- 1 Introduction
- 1.1 Audience
- 1.2 Overview
- 1.3 Envoy CMU Features
- 1.4 Configuration Options for Envoy
- 2 Operation of Envoy
- 3 CPDLC Operations
- 3.1 Log On
- 3.2 Logoff
- 3.3 Lost Connection
- 3.4 Typical Message Composition
- 3.5 ATC Menu
- 3.5.1 ATC Request Menu – FANS 1/A+ and ATN B1 CPDLC Common
- 3.5.2 ATC REPORT Menu
- 3.5.3 WHEN CAN WE EXPECT
- 3.5.4 POS REPORT Message – FANS 1/A+
- 3.5.5 EMERGENCY (MAYDAY) Message – FANS 1/A+
- 3.5.6 ATC MSG LOG
- 3.5.7 CLEARANCE REQUESTS – FANS 1/A+
- 3.5.8 FREE TEXT 1/2
- 3.5.9 ATC VOICE CONTACT Message – FANS 1/A+
- 3.5.10 Cancel EMERGENCY, Cancel ADS
- 3.5.11 Flight Plan Transactions and Monitoring
- 4 Automatic Dependent Surveillance (ADS)
- 5 ACARS Operations
- 6 MAINTENANCE Menu
- Appendix A Acronyms
- Appendix B AFN Messages
- Appendix C Supported CPDLC Messages
- Appendix D ADS-C Tags
- Appendix E ACARS Message Labels
- Appendix F ATSU Call Signs (ICAO, IATA)
- Appendix G Fault Management
User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 51 of 173
3.5.5 EMERGENCY (MAYDAY) Message – FANS 1/A+
Use the EMERGENCY page to send an urgent emergency request to change route. This page can
be used to build many types of emergency requests and contains mutually exclusive fields.
Figure 3-20 EMERGENCY—two of several possible views
Mutually exclusive fields are detailed in two possible views in Figure 3-20, and further described in
Table 3-14 EMERGENCY Fields.
Table 3-14 EMERGENCY Fields
LSK
Label
Description
L1
URGENCY
Required. Selection list:
• MAYDAY (default)—if selected, LSK R4 and R5 are disabled
• PAN PAN PAN—if selected, LSK R4 and R5 are disabled
• FUEL-SOULS – if selected, LSK L3, L4, L5, R1 are disabled
L3
DESCENDING TO
Optional. Flight level or altitude. Unavailable if URGENCY set to FUEL-
SOULS
L4
OFFSETTING
Optional. 0 to 99 L or R of current flight path. Unavailable if URGENCY
set to FUEL-SOULS
R1
CAUSE
Selection list. Available only if MAYDAY or PAN PAN PAN is selected at
LSK L1
• <blank> (default)
• ENGINE
• CAB PRESS
• FIRE
• HIJACK
R4
REMAINING FUEL
Optional. Time in HH:MM. Autopopulated or manually input. Available
only if URGENCY is set to FUEL-SOULS at LSK L1
R5
SOULS
Optional. Number of people on board (0 to 999). Available only if
URGENCY is set to FUEL-SOULS at LSK L1
R6
VERIFY
Available only when all required fields have been entered.
Note URGENCY selections MAYDAY and FUEL SOULS construct a downlink with a HIGH
LEVEL OF ALERT.
PAN PAN PAN constructs a downlink with an URGENT LEVEL OF ALERT.
Emergency Messages:
• HH:MM OF FUEL REMAINING AND --- SOULS ON BOARD
• MAYDAY MAYDAY MAYDAY DESCENDING TO FL350
• PAN PAN PAN OFFSETTING 99R (99KM right of current flight path)