User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 108 of 173
Acronym/Term
Definition
FMC
Flight Management Computer (or FMS, flight management system), a fundamental
component of an airline’s avionics that automates a variety in-flight tasks, reducing the
workload of the aircrew.
FOB
Fuel on Board (LB, KG or MINUTES)
GOB
General Output Bus
GOLD
Global Operational Data Link Document, ICAO standard for CPDLC
IATA
International Air Transport Association
ICAO
International Civil Aviation Organization
LSK
Line Select Key
MAS
Message Assurance
MCDU
Multifunction Control and Display Unit
NAT HLA
North Atlantic Track High Level Airspace
NDA
Next Data Authority, appears on ATC LOGON/STATUS 1/2
NOTAM
Notice to Airmen
OOOI
Event triggers for ACARS: Gate Out, Wheels Off, Wheels On, Gate In
PBIT
Power-On Built-In Test
SATCOM
Satellite Communications
SQP
Signal Quality Parameter
TSAP
Transport Services Access Point, database of valid facility IDs for ATN B1
TWIP
Terminal Weather Information for Pilots
UDM
User Defined Message (ACARS AOC)
UM
Uplink Message (see CPDLC Uplink Message ElementsAppendix B andACARS
Uplink Message Labels )
UTC
Universal Time Coordinated
VDL
VHF Data Link
VDR
VHF Data Radio
VFR
Visual Flight Rules
VHF
Very High Frequency
VMC
Visual Meteorological Conditions to use VFR