alteration or change is made to an already existing
component. Examples may be shortening the shaft of
a variable resistor, or adding a program to a circuit
card to produce a programmed circuit card.
AIDS Aircraft Integrated Data System
AIEM Airlines International Electronics Meeting
AIL Aileron
AIMS Aircraft Information Management System
AIP Aeronautical Information Publication
AIRCOM Digital air/ground communications services provided
by SITA. A system similar to ACARS.
AIR DATA Those parameters that can be derived from knowl-
edge of the air mass surrounding the aircraft.
Airways The standard ICAO IFR routes
AIS Aeronautical Information Services
AISC Aeronautical Industry Service Communication
AIV Accumulator Isolation Valve
A/L Autoland
ALC Automatic Level Control. A circuit used to maintain
the output of a transmitter regardless of variations in
the attenuation of the system.
ALS Advanced Landing System
ALT (1) Airborne Link Terminal
(2) Altitude
Altitude A continuous return across the display at a range
Ring equivalent to aircraft altitude (WXR).
ALTS Altitude Select
ALU Arithmetic and Logic Unit
AM Amplitude Modulation. A signal where the carrier sig-
nal is varied in amplitude to encode voice or data
information.
AMASS Airport Movement Area Safety System
AMC Avionics Maintenance Conference
AMCP Aeronautical Mobile Communications Panel
AME Amplitude Modulation Equivalent. An AM type signal
that processes the modulated information signal and
carrier frequency separately and then reconstructs
the two signals to make an equivalent AM signal.
AMI Airline Modifiable Information
AMLCD Active Matrix Liquid Crystal Display
AMOSS Airline Maintenance and Operations Support System
AMP Audio Management Panel
AMPL Amplifier
AMS Apron Management Service
AMS(R)S Aeronautical Mobile Satellite (Route) Service
AMSS (1) Aeronautical Mobile Satellite Service
(2) Aeronautical Mobile Satellite System
AMTOSS Aircraft Maintenance Task Oriented Support System.
An automated data retrieval system.
AMU Audio Management Unit
AMUX Audio Multiplexer
A/N Alphanumeric
Aneroid An evacuated and sealed capsule or bellows which
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