User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 15 of 173
The Envoy handles ACARS print uplink and printer status downlink messages automatically.
Aircrew can print CPDLC and ACARS messages and message logs for general reference.
Printable pages display a PRINT or PRINT LOG action.
1.3.9 Maintenance
Envoy’s maintenance menu provides aircrew with dynamic data, including:
• Aircraft status, flight log, fault log, and test results can be printed for general records
• Monitoring and status
o Configured discretes
o Flight log
o Signal strength, frequency, and identifier for nearby VHF ground stations
• System configuration data, including current VDR function
• Aircraft ICAO ID
• Operating software and versions
• Fault log and fault status
• Station Table showing current and available VHF stations by frequency and signal strength
System Test
While on ground, aircrew can run and print results for Envoy system tests:
• Link Test
• Setting UTC time
• Test Envoy annunciators and display
Maintenance Mode
Maintenance mode is password protected. While on the ground, maintenance personnel with
password access can:
• Load application and database updates
• View and troubleshoot data busses and labels
• Change/invert bus speeds
• Change/invert discrete outputs and inputs.
• Check received data (SSM/SDI values)
For additional information, see the Envoy Installation Guide or Component Maintenance Manual.
1.4 Configuration Options for Envoy
The factory built-in functionality of features and data systems are reflected in the Envoy configuration, which can be viewed on the
UNIT CONFIG 1/3 pages described in Section 0.