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 14 of 173
(ADS applications) that are compatible with the Aeronautical Telecommunications Network (ATN)
concept.
The ADS system has three contract modes of operation: periodic contract mode, event contract
mode, and demand contract mode. Each of these modes may be active simultaneously; the Envoy
supports up to five active ADS-C reports.
The Envoy is designed to support Reduced Lateral Separation Minima within the North Atlantic,
where flights are separated by ½-degree latitude.
The ADS-C requests by ATSUs identify modulus (reporting cycle, typically every 5 minutes), which
types of information is to be sent, along with conditions, such as frequency. Some types of
information are included in every report, while other types are provided every 3
rd
or 4
th
report.
The aircraft can also send unsolicited ADS-C emergency reports. The Envoy has conditional logic
that can detect irregular aircraft movement based on configured aircraft sensors exceeding
predefined thresholds, and will then automatically downlink an abnormal position report at
emergency rate (1 minute intervals) using Aircraft Communications Addressing and Reporting
System (ACARS).
1.3.5 Hosted Devices (SAT, ARINC 739)
The Envoy can be configured to emulate other devices, such as one or more ARINC 739
Multipurpose Control and Display Units (MCDUs). Hosted devices can be accessed by pressing
the MENU function key, and then pressing the appropriate LSK for the device, as shown in the two
views of the MAIN MENU in Figure 1-1.
This document focuses on the ENVOY. Refer to airline company documentation for using hosted
devices.
1.3.6 ARINC 741/739 Satellite Communication (SATCOM)
Connections made to an ARINC 741 compliant SDU data channel support both FANS 1/A+
CPDLC messages and ACARS messages over a SATCOM connection. In addition, the Envoy can
also support SDU dialer functions.
The Envoy essentially is a Communications Management Unit (CMU) supporting ACARS
communication over VDL Mode A/1 and SATCOM. Values for expiration times vary by media (VDL
A/2 or SATCOM) for uplinks, downlinks, technical acknowledgements, and validation and routing
of ACARS message sequencing.
1.3.7 Flight Plan Management and Navigation
The Envoy can be configured with a Flight Management Computer (FMC) and EFIS to load, track,
and modify the active route and report waypoints, transition points, and segments. The Envoy
maintains its own copy of the flight plan and transmits route data between ATC and the FMC.
1.3.8 Printer Capability
The aircrew can securely send and print AOC and ATC messages and message logs.
If a cockpit printer is connected, the Envoy can monitor printer status. If the status of a configured
printer changes, an advisory message displays in the scratchpad and is available on the System
Monitor page. System Test in the Maintenance menu also offers printer test results.