to view Definitions of Aircraft Options
AC - Advisory circular.
A/C - Airconditioning Unit
ACARS - Airline communications and
AD - Airworthiness Dirctive.
Maintenance or modification ordered by FAA.
ADC - Air Data Computer
ADF - Automatic Direction Finder
ADI - Attitude direction indicator
ADS - Automatic dependent
AES - Aircraft Earth station.
AFCS - Automatic flight control
AFD - Adaptive flight displays.
AFDS - Autopilot flight director
AFIS - Automated flight information system
AHRS - Attitude-heading reference system.
AI - Altitude indicator
aileron - A small hinged portion of an airplane's
wing, used to make an airplane roll, or turn around its long
air data - Values cmputed from pitot, static and
temperature measurements, usually by means of a digital
computer; ARINC 575 defines outputs.
airfoil - A surface, such as an airplane wing,
shaped to produce more lift than resistance when driven
through the air.
All-weather fighter - A radar-equipped jet fighter
airplane which can operate at night or in the worst weather.
All-weather interceptor - A radar-equipped jet
fighter airplane which can operate at night or in the worst
AM - Amplitude modulation.
AME - Aviation Medical Examiner (U.S.)
AMLCD - Active-matrix liquid
Annual - Mandatory inspection of airframe and
powerpland that occurs every 12 months.
AOA - Angle-of-attack
AP - Auto Pilot
APR - Auxiliary Power Reserve
APU - Auxiliary power unit
ARINC - Aeronautical Radio, Inc. A
nonprofit corporation owned by member airlines to define
form, fit and function of avionics equipment and to provide
radio communication services.
ARINC 419 - Digital
information transfer characteristics as applied in ARINC
500-series equipment specifications.
ARINC 547 - Digital specification for ILS reference
ARINC 561 - Inertial navigation system
ARINC 568 - Inertial sensor DME
ARINC 571 - Inertial sensor
attitude-heading reference system specifications.
ARINC 575 - Digital air-data system specifications.
ARINC 700-series - All-digital
equipment specifications for new-generation transport
ARINC 743 - All-digital
specificaitons for FANS-1 compatibilty.
ASA - Autoland status annunciator.
ASCB - Avionics standard communication bus
A/T - Auto throttle.
ATC - Air Traffic Control. The people in control
towers (at airports that have them) to regulate takeoffs,
landings, and planes moving through their general area.
ATI and ATR - ARINC from factors.
ATM - Air traffic management.
ATP - Airline Transport Pilot (the
"highest" grade of pilot certificate)
Audio Panel - Electronic device
used to switch between radios.
Autogyro - An aircraft equipped with a rotating
wing, or rotor, to sustain itself in the air, and a
propeller to move forward.
AUX Fuel - Auxiliary fuel tanks.
AWACS - Airborne Warning And Control System. An
electronically very souped-up Boeing 707. [Pronounced
Barnstormer - A pilot who, in the early years of
aviation, gave airplane rides to people and performed
aerobatics for a fee.
Basic Operating Weight (BOW)
Empty weight typically equipped + unusable fuel and
trapped liquids + 2 pilots (400 lbs.) + supplies.
BCD - Binary coded decimal.
Beam width - The included angle of a weather radar
Bendix - Avionics mfgr.
BITE - Built-in test equipment.
Bleed Air - High pressure air ducted from engine to
pressurize cabin and other uses.
Boeing -``The Boeing Company, with headquarters in
Seattle, Washington, U.S., is the world's leading
manufacturer of commercial airplanes and one of the nation's
largest exporters. The company is a major U.S. government
contractor, with capabilities in space systems, helicopters,
military airplanes, missile systems, information and
electronic systems and software products.''
Boots - Inflatable device on leading edge
of wings and tail. Used to remove ice.
Bracing wire - A solid steel wire used to support
the structure of an airplane's wings or fuselage.
BRG - Bearing.
BSU - Beam steering unit.
CAB - Civilian Aviation Board.
Cabin pressurization - A mechanism used to
maintain air pressure in an airplane's sealed cabin at a
level suitable for passengers.
Canard - An airplane designed to have its
normal horizontal tail surface on the front rather than the
rear of its fuselage.
Caster - To swivel or rotate slightly.
Category I (CAT I) - An
ILS facility providing operation down to a 200 foot decision
height and an RVR of not less than 2,400 feet.
Category II (CAT II) - An ILS
facility providing operation down to a 100-foot decision
height and an RVR of not less than 1,200 feet.
Category IIIa (CAT IIIa) - An ILS facility
providing operation with no decision height to and along the
surface of the runway with external visual reference during
the final phase of landing and with an RVR of not less than
Category IIIb (CAT IIIb) - An ILS facility
providing operation with no decision height limit to and
along the surface of the runway without reliance on external
visual reference and, subsequently, taxiing with an external
RVR of not less than 150 feet.
Category IIIc (CAT IIIc) - An ILS facility
providing operation with no decision height limit to and
alsont the surface of the runway and taxiways without
reliance on external visual reference.
CAVU - Ceiling And Visibility Unlimited. Perfect
flying weather -- no major clouds, no major haze.
CD-ROM - Compact disc read-only memory.
CDU - Control-display unit.
Centre-pod configuration - A type of airplane whose
fairly short fuselage is not connected to the tail surfaces.
CESC - Cescom Maintenance Program.
CFI - Certified Flight Instructor.
CMOS - Complementary metal oxide
CMU - Communications management unit.
CNS - Communications, navigation and surveillance.
Coherent detection - A technique used in certain
ADF receivers to improve useful range.
Collins - Avionics mfgr.
COM - Communications.
Comosite video - Analog VOR receiver output before
CONT - Teledyne-Continental (engine mfgr.)
Contact digitizer - A mechanical device that
converts analog information to digital codes by means of
Cowling - A removable metal covering placed
over and around an airplane's engine(s).
C/R - Counter-rotating propellers.
Cross-over exhaust - A mechanism through which the
exhaust from one side of an inline engine is carried to the
CRT - Cathode ray tube.
CSDB - Commercial standard data bus.
CVR - Cockpic Voice Recorder. Device that records
crew conversations. Used in accident investigations.
CW - Continuous wave. A radio carrier
broadcast that does not have modulation.
Cycles - Pertaining to turbine engines. Cycle
begins with starting, continues through full-power, and ends
DA - Drift angle.
DADC - Digital air-data computer.
dB - Decibel.
DG - Directional gyro.
DGPS - Differential global positioning system. LA-
prefix refers to local area DGPS; WA- prefix refers to
wide-area DGPS signal retransmission schemes.
Digitizer - Any electronic device capable
of converting information to a digital format; usually
refers to encoding devices that convert sensed altitude into
a transponder code.
DME - Distance Measuring Equipment.
DP - Deal Pending.
DR - Ded (deduced) reckoning.
drms - Distance root mean squared.
DTK - Desired track.
DTU - Data transfer unit.
Duplex - Separate channels for transmitting
EAROM - Electrically alterable read-only memory, a
type of digital memory device.
EEPROM - Electrically erasable programmable
EEVIP - Early Extended Validation Integration
Program. An FAA program, first implemented for the Boeing
777, to give ``out-of-the-box'' ETOPS clearance to a new
plane, rather than waiting for a couple of years of domestic
EFIS - Electronic Flight
EGT - Exhaust gas temperature
EICAS - Engine indicating and crew alerting system.
Elevator - A small control surface hinged to the
rear of the horizontal stabilizer and used to tilt an
airplane up or down.
encal - Encoding Altimeter
Encoder - Displays aircraft's altitiude on
ground-based radar screens.
Engine cowl - A removable metal covering placed
over and around an airplane's engine.
EROS - Brand Name for Oxygen Mask
ETOPS - Extended Twin-engine operations. FAA
designation of over-ocean flights far from possible
emergency landing strips, in which the possibility of engine
failure in a twin-engine plane represents a heightened risk.
ETOPS certification is not normally given to a new passenger
aircraft until it has been in regular domestic service for
at least a year.