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 12 of 173
Manage ADS contract reporting
• View status of aircraft and aircraft sensors
o System Config
o Engine Data
o Doors
o Flaps
o Air/Gnd
o Parking Brake
The Envoy can host up to three (3) additional devices, including SATCOM, FMS, and DFDAU and
can perform as a SATCOM dialer or request or relay voice contact settings to other aircraft.
Depending on which features are enabled, the main menu may display the Envoy top level menu
(described in Section 2.1) or the host menu with direct access to hosted devices.
Figure 1-1 Envoy Main Menu (left), Envoy Configured with 3 Hosted Devices (right)
Factory configurations offer any combination of one or more of the following COMM protocols:
FANS 1/A+ (CPDLC and ADS-C)
ATN B1 CPDLC
ACARS
The Envoy Part Number, described in Section 1.4, reflects the enabled features.
The following sections describe Envoy features in detail. For operation of the Envoy display, see
Section 2.
1.3.1 ATC (CPDLC)
ATC functionality uses FANS 1/A+ or ATN B1 CPDLC or both. CPDLC resolves the shortcomings
of voice communication, such as voice channel congestion, misunderstanding due to bad voice
quality and/or misinterpretation, and corruption of the signal due to simultaneous transmissions.
CPDLC offers:
• Preferred/more direct oceanic routing
• Fewer delays on the ground while awaiting clearance
• Fully automated position reporting
• Digital data link communication with ATC
Although both ATN and FANS CPDLC provide data link capabilities between the aircrew and air
traffic controllers, a given airspace uses only one CPDLC mode; consequently, the FANS and ATN
applications do not operate simultaneously.
For more information about logging on to a CPDLC session, see Section 3.1.