User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 58 of 173
3.5.10 Cancel EMERGENCY, Cancel ADS
In FANS COMM, the Envoy provides the interface to cancel ADS emergency mode, if it has been
turned on via a MAYDAY MAYDAY or PAN PAN PAN free text downlink message.
The ATC LOGON/STATUS 2/2 page provides the interface to cancel ADS EMERGENCY mode
and to view or cancel established ADS-C contracts.
For more information, see:
• Section 4.1 ADS-C
• Section 4.2 ADS Emergency
3.5.11 Flight Plan Transactions and Monitoring
The Envoy fully supports forwarding cleared flight plans and cleared route modifications from ATC
to the FMC, saving the aircrew from manually inputting route data. The Envoy can retrieve active
route information and send to the current data authority (CDA). The Envoy tracks active route
information from the EFIS and FMC, populating feasible FANS route mod requests and status
reports for ADS-C downlinks.
This example shows how an ATC uplink message that contains flight plan data is processed by the
Envoy.
Step 1. Uplink Message Receipt
The Envoy receives a ROUTE CLEARANCE
uplink and the ATC annunciator illuminates.
Press the ATC function key.
The ROUTE CLEARANCE page displays the
message detail.
If FMC is available, SEND TO FMC displays at
LSK R6.
Step 2. Negative Response from FMC
If there’s an error in the format, the Envoy
responds with an error notification in the
scratchpad.
The aircrew will need to enter the route change
manually.