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 62 of 173
Table 4-1 ADS-C Contract Types
4.2 ADS Emergency
Aircrew has the option to send an ADS-C emergency message without a facility having a contract.
There are several ways to activate ADS Emergency Mode:
• Press and hold the ATC function key for 5 seconds or more to initiate the ADS Emergency Mode.
• The keywords MAYDAY MAYDAY MAYDAY or PAN PAN PAN in any free text message.
• For devices logged onto FANS 1/A+:
o EMERGENCY page is a preformatted message at LSK L5 on the ATC main menu. See
Section 3.5.5
o ADS-C Emergency mode can be activated or deactivated from the FANS ATC
LOGON/STATUS 2/2 page.
When logged into a FANS CPDLC session, the ADS EMERGENCY can be enabled/disabled from
the ATC LOGON/STATUS 2/2.
From the ATC menu:
• Press the ATC function key.
• Press LSK R6, then press NEXT to open the ATC LOGON/STATUS 2/2 page.
• To cancel emergency mode, on the ATC LOGON/STATUS 2/2 page, press LSK R1 to toggle ADS
EMER to OFF.
• To cancel ALL ADS contracts, press LSK L1 to toggle ADS to OFF.
• To cancel an ADS-C contract with a specific ground station, press LSK R3 to open MONITOR 6/6,
which shows the active ADS contracts. To view the details of a given ADS contract, click the
respective LSK. See Section 6.3.5 for additional information
Figure 4-1 ADS Emergency (OFF/ON) Toggle at LSK R1
Type
Example(s)
Periodic
Automatically send a position report every 14 minutes.
Emergency
Automatically send a position report every 1 minute.
Demand
Interrogation of the aircraft for specific information; i.e., what is the aircrew current position?
Event
Events can trigger a report to be automatically downlinked. Typical events are:
• Waypoint change event – downlinked when the active waypoint is changed.
• Level range deviation event (LRDE) – downlinked when the aircraft flight level deviates
outside of the tolerance defined in the contract.
• Lateral deviation event (LDE) – downlinked when the aircraft lateral deviation from the defined
path exceeds the defined tolerance.
• Excessive rate of descent or climb.