FullDescription:Avionics

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Air data computer

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central air data computer

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Abbreviation

ADC

Definition

A device which computes altitude, vertical speed, air speed and mach number from inputs of pitot and static pressure and temperature.

Definition Source

NATO (1998) glossary of terms and definitions, North Atlantic Treaty Organization. Military Agency for Standardization.

Bruxelles : OTAN, 1998

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Airborne collision avoidance system

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Term airborne collision avoidance system
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Traffic Alert and Collision Avoidance System

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Abbreviation

ACAS

Definition

An aircraft system based on secondary surveillance radar (SSR) transponder signals which operates independently of ground-based equipment to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders.

Definition Source

ICAO (2006) Official definition taken from doc. PANS-OPS/I Procedures for Air Navigation Services — Aircraft Operations — Flight Procedures [Doc 8168/I] 2006

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Airborne data bus

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Term airborne data bus
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Abbreviation

Definition

the physical connection between avionics system elements carrying the digital data.

Definition Source

EUROCONTROL (2004) EATM glossary, June 2004

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Presently the defined bus types are: ARINC 429. Low speed, single transmitter, point to point; ARINC 629. Medium speed, multi-transmitter, linear bus; ARINC 636. Very high speed, daisy chain, using optical fibre, ARINC 646. High speed, multi-transmitter, linear bus; ARINC 659. Special Integrated Modular Avionics (IMA) back plane bus.

Aircraft data link processor

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Term aircraft data link processor
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airborne data link processor

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Abbreviation

ADLP

Definition

An aircraft-resident processor that is specific to a particular air-ground data link (e.g. Mode S) and which provides channel management, and segments and/or reassembles messages for transfer. It is connected to one side of aircraft elements common to all data link systems and on the other side to the air-ground link itself.

Definition Source

ICAO Official definition added to An 10/III by Amdt 71 (7/11/1996) and modified by Amdt 77 (28/11/2002)

AN 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., p. 5-1

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Aircraft earth station

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Term aircraft earth station
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airborne earth station

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ground earth station (GES)

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Abbreviation

AES

Definition

A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications ) by Amdt 70 (9/11/1995)

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Attitude Heading Reference System

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AHRS

Definition

An integrated flight instrument system that provides attitude, heading, rate of turn, and slip/skid information.

Definition Source

FAA Advanced Avionics Handbook (2009), Glossary, [1]

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Attitude director indicator

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Term attitude director indicator
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attitude display indicator

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Abbreviation

ADI

Definition

3-D cockpit display forming development of traditional horizon and usually linked with autopilot and other elements forming flight-director system.

Definition Source

Bill Gunston, Editor, Jane’s Information Group, "The Cambridge Aerospace Dictionary", 2004

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Automated Air/Ground Data Interchange

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Term Automated Air/Ground Data Interchange
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Abbreviation

AAGDI / AGADE

Definition

the means by which airborne avionics and processing systems communicate with ground-based systems.

Definition Source

EUROCONTROL (1998) Operational Requirements for ATM Air/Ground Data Communications Services OPR.ET1.ST5.1000-ORD-01-00, Appendix A GLOSSARY AND ABBREVIATIONS, Ed. 1.0

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Automatic Flight Control System

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Term Automatic Flight Control System
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AFCS

Definition

A system which includes all equipment to control automatically the flight of an aircraft or missile to a path or attitude described by references internal or external to the aircraft or missile.

Definition Source

NATO, NATO STANDARDIZATION AGENCY (NSA) (2004), "NATO GLOSSARY OF TERMS AND DEFINITIONS (ENGLISH AND FRENCH)", Document AAP-6(2004). URL: http://www.nato.int/docu/stanag/aap006/2004-introduction.pdf

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Cockpit Display of Traffic Information

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Term Cockpit Display of Traffic Information
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Abbreviation

CDTI

Definition

A generic avionics device on the flight deck that is capable of displaying the position information of nearby aircraft. It may also include ground reference points and navigation information to increase the AIRSAW.

Definition Source

ICAO, DOC 9758 Human Factors Guidelines for Air Traffic Management (ATM) Systems 2000, 1st ed., p. 8-1 (8.3.3)

AMCP/7 WP/50, 2000-03-14, p. 2 (2.4)

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Controller-pilot data link communications

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Term controller-pilot data link communications
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SESAR

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data link

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Abbreviation

CPDLC

Definition

A means of communication between controller and pilot, using data link for ATC communications.

Definition Source

ICAO Annex 2 Rules of the Air, Tenth Edition, July 2005

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Lexicon Release

Lexicon Release 2015.2

Flight Management System

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Term Flight Management System
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Automatic Flight Control System

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Abbreviation

FMS

Definition

1. An integrated system, consisting of an airborne sensor, receiver and computer with both navigation and aircraft performance databases, which provides performance and RNAV guidance to a display and automatic flight control system.

2. an on-board multi-purpose navigation, performance, and aircraft operations computer designed to provide virtual data and operational harmony between closed and open elements associated with a flight from pre-engine start and take-off, to landing and engine shut-down.

Definition Source

1. ICAO, Technical Committee of the Regional Safety Oversight Cooperation System, ADVISORY CIRCULAR, AC : 91-008, DATE : 12/10/09, REVISION : 1, ISSUED BY : SRVSOP, SUBJECT: AIRCRAFT AND OPERATORS APPROVAL FOR RNP APPROACH (RNP APCH) OPERATIONS

2. SKYBRARY website [2]

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Fly-by-wire system

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Abbreviation

FBW

Definition

Flight control system in which a computer processes the pilot's commands and sends them to the flight control surface actuators by electrical signals rather than mechanical linkage; backup modes may bypass the computer.

Definition Source

ICAO, TRD Technical File, Air Line Pilot, 2/2000, p. 20 (FBW Glossary)

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FBW also includes 'fly-by-light', in which the same effects are accomplished through fiber-optic cables. Power-by-wire', means the actuators themselves are electric.

Full Authority Digital Engine Control

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full authority digital engine control

full-authority digital electronic engine control

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FADEC

Definition

a system consisting of a digital computer and ancillary components that control an aircraft’s engine and propeller. First used in turbine-powered aircraft, and referred to as full authority digital electronic control, these sophisticated control systems are increasingly being used in piston powered aircraft.

Definition Source

Federal Aviation Administration (FAA)Pilot's Handbook of Aeronautical Knowledge (2008), Chapter 6 (Aircraft Systems) [3]

Note

In a spark ignition reciprocating engine the FADEC uses speed, temperature, and pressure sensors to monitor the status of each cylinder. A digital computer calculates the ideal pulse for each injector and adjusts ignition timing as necessary to achieve optimal performance. In a compression ignition engine the FADEC operates similarly and performs all of the same functions, excluding those specifically related to the spark ignition process. (same source)

Ground proximity warning system

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Abbreviation

GPWS

Definition

A system which provides automatically a timely and distinctive warning to the flight crew when the aeroplane is in potentially hazardous proximity to the earth's surface.

Definition Source

ICAO Annex 6 (Para 6.15.4) to the Chicago Convention

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Non Volatile Memory

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Abbreviation

NVM

Definition

the name given to the ‘flash’ RAM found in many items of solid state avionic equipment fitted to modern aircraft. ‘Non Volatile’ means that, subject to memory capacity, stored data is retained when electrical power is removed.

Definition Source

SKYBRARY, reference tool for aviation safety knowledge [4]

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NVM is most often included in a design to aid fault identification and rectification by the provision of a history of recorded fault signals. Many familiar items of avionic equipment are nowadays of solid state design and incorporate NVM.

Traffic Alert and Collision Avoidance System

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Term Traffic Alert and Collision Avoidance System
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Airborne collision avoidance system

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Abbreviation

TCAS

Definition

A type of airborne collision avoidance system (ACAS) based on a family of airborne equipment that functions independently of the ground-based ATC system to detect potential conflicting aircraft that are equipped with secondary surveillance radar (SSR) transponders.

Definition Source

Transport Canada, Glossary for Pilots and Air Traffic Services Personnel, URL: http://www.tc.gc.ca/eng/civilaviation/secretariat-terminology-glossary-205.htm

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There are three different versions: TCAS I provides traffic advisories; TCAS II provides traffic advisories and vertical resolution advisories (RA); and TCAS IV, when developed, will provide traffic advisories and vertical and horizontal RAs.