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 13 of 173
ATN B1 CPDLC
ATN B1 messaging is available throughout Europe. See Appendix C for VDR ATN B1 in Europe.
Aircrew requests, instructions, responses, and network acknowledgements i.e. Uplink and
Downlink messaging can be transmitted in microseconds, alleviating radio frequency congestion in
the European airspace.
The Envoy offers robust connectivity via a proprietary VHF Digital Link (VDL) Mode 2 station
management algorithm to ensure that the strongest station is used for ATN B1 CPDLC
communication. Performance requirements for ATN B1 necessitate the use of VDL Mode 2 only.
FANS 1/A+ CPDLC
FANS 1/A+ is widely used in the Americas, Pan-Asia, and many parts of Europe. FANS 1/A+
CPDLC prefers VHF Mode 2 and can operate over SATCOM. FANS messaging is not available
over VHF Mode A.
FANS also supports routing Air Traffic Services (ATS) messages, such as:
• ADS-C reporting
• D-ATIS/TWIP Weather
• Departure/Oceanic Clearances
1.3.2 Log Files
The Envoy tracks message transactions and event-based reports such as Out-Off-On-In (OOOI)
events, and maintains log files for ATC, ACARS, and flight information for the current flight and
previous flights.
1.3.3 ACARS
Aircraft Communications Addressing and Reporting Systems (ACARS) provides messaging
capabilities to support data link communications for:
• Air Traffic Control (ATC) messages, such as:
o Departure Clearance
o Oceanic Clearance
o Pushback Clearance
o Taxi Clearance
• Aeronautical Operational Control (AOC), or company-specific reports, such as OOOI (Out-Off-On-In)
data
• Airline Administrative Control (AAC), such as weather information uplinks (D-ATIS, TWIP)
The Envoy has a default menu and page structure for user-defined messages, described in
Section 2.1 of this document.
1.3.4 ADS Contracts (ADS-C)
The Envoy is equipped with an Automatic Dependent Surveillance Function (ADSF) to provide
automated reports with dynamic aircraft information such as latitude, longitude, altitude, time,
identification, waypoint information, track or heading, airspeed, wind speed, wind direction, static
air temperature, and other elements of navigational intent for surveillance and/or route
conformance monitoring based on ADS-C request(s) from ground-based end system applications