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AAIB Air Accidents Investigation Branch
AAS Anti-icing Advisory System
AC Advisory Circular; provides nonregulatory guidance to certificate holders for a means (but not necessarily the only means) to comply with Federal Aviation (FAA) Regulations
ACARS Automatic Communications and Recording System
Accident An occurance associated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight and until such persons have disembarked and in which :

(a) a person is fatally or seriously injured as a result of
  • being in the aircraft
  • direct contact with any part of the aircraft, including parts which have become detached from the aircraft or
  • direct exposure to jet blast

Except when the injuries are from natural causes, self inflicted or inflicted by other persons, or when the injuries are to stowaways hiding outside the areas normally available to the passengers and crew; or

(b) in which the aircraft sustains damage or structural failure which :

  • adversely affects the structual strength, performance or flight characteristics of the aircraft and
  • would normally require major repair or replacement of the affected component, except for engine failure or damage, when the damage is limited to the engine, its cowlings or accessories; or for the damage limited to propellers, wingtips, antennas, tyres, brakes, fairings, small dents or puncture holes in the aircraft skin; or

(c) the aircraft is missing or completely inaccessible

ACO Aircraft Certification Office (FAA)
AD Airworthiness Directive; FAA regulatory requirement for immediate mandatory inspection and/or modification
ADC Air Data Computer
ADS Air Data Sensor
AEG Aircraft Evaluation Group (FAA)
AFFF Aqueous Film-Forming Foam
AFM Aircraft Flight Manual
AGL Above ground Level
AHRS Attitude and Heading Reference System
AIM Aeronautical Information Manual; a primary FAA publication whose purpose is to instruct airmen about operating in the U.S. National Airspace System
AIRMET Airman's Meteorological Information; such advisories to flightcrews include, but are not limited to, moderate icing and moderate turbulence
ALPA Air Line Pilots Association
AMASS Airport Movement Area Safety System
AMM Aircraft Maintenance Manual
AOA Angle-Of-Attack
AOM Aircraft Operating Manual
APM Aircrew Program Manager
APOI Assistant Principal Operations Inspector (FAA)
ARAC Aviation Rulemaking Advisory Committee
ARFF Aircraft Rescue and Fire Fighting
ARSA Airport Radar Service Area
ARTCC Air Route Traffic Control Centre; A facility established to provide air traffic control service to aircraft operating on IFR flight plans within controlled airspace and principally during the en-route phase of flight
ASDE Airport Surface Detection Equipment
ASR Airport Surveillance Radar
ASRS Aviation Safety Reporting System (NASA)
ATC Air Traffic Control
ATCS Air Traffic Control Specialist
ATCSCC Air Traffic Control System Command Centre
ATCT Air Traffic Control Tower
ATIS Automatic Terminal Information Service; The continuous broadcast of recorded noncontrol information in selected terminal areas. Automated, repetitive transmission of essential but routine information
ATR Avions de Transport Regional (Manufacturer)
ATSB Australian Transportation Safety Board
BAA Bilateral Airworthiness Agreement
BEA Bureau Enquetes-Accidents (France)
BRITE Bright Radar Indicator Tower Equipment
CAA Civil Aviation Authority (UK)
CAB Civil Aeronautics Board (now FAA)
CAM Cockpit Area Microphone
CAMI Civil Aeromedical Institute (FAA)
CASA Civil Aviation Safety Authority (Australia)
CASA Construcciones Aeronauticas, S.A. (manufacturer)
CCP Control Column Position
CDL Configuration Deviation List
Ceiling The heights above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as "broken", "overcast" or "obscuration" and not classified as "thin" or "partial"
CFIT Controlled Flight into Terrain
CFM Company Flight Manual
CFR Code of Federal Regulations
CFR Crash, Fire & Rescue
CG Centre of Gravity
CRM Cockpit Resource Management
CTA Centro Tecnico Aerospacial (Brazil)
CVR Cockpit Voice Recorder
CWA Centre Weather Advisories
CWP Control Wheel Position
CWSU Centre Weather Service Unit
DER Designated Engineering Representative
DFDR Digital Flight Data Recorder
DGAC Direction Generale de L'Aviation Civile (France)
DH Decision Height; the height at which a decision must be made during an ILS, MLS or PAR instrument approach to either continue the approach or execute a missed approach
DME Distance Measuring Equipment
EADI Electronic Attitude Display Indicator; indicating pitch and roll attitudes
EDCT Expect Departure Clearance Time
EFC Expect Further Clearance; from ATC
EFIS Electronic Flight Information System
EHSI Electronic Horizontal Situation Indicator
Emergency Evacuation An emergency evacuation carried out under the control, or partial control, of the crew
FAA Federal Aviation Administration
FAR/JAR Federal Aviation Regulation/Joint Airworthiness Requirements
Fatal Injury An injury resulting in death within 30 days of the accident
FCOM Flightcrew Operating Manual
FDR Flight Data Recorder
Ferry Flight A flight for the purpose of returning an aircraft to base, delivering an aircraft from one location to another or moving an aircraft to and from a maintenance base
FL Flight Level; a level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. Each is stated in 3 digits that represent hundreds of feet. E.g. FL250 = 25,000 ft
FMRB Flight Manual Review Board
FOQA Flight Operations Quality Assurance
FPL Full Performance Level
FSB Flight Standards Bulletin
FSDO Flight Standards District Office (FAA)
FSM Flight Standards Manual
FSS Flight Service Station; Air traffic facilities, which provide pilot briefing, en-route communication and VFR search and rescue services, assist lost aircraft and aircraft in emergency situations, relay ATC clearances, originate Notices to Airmen, broadcast aviation weather and NAS information, receive and process IFR plans and monitor NAVAIDs
G One G is equivalent to the acceleration due to Earth's gravity
GAO General Accounting Office
GOES Geostationary Operational Environmental Satellite
GMT Greenwich Mean Time (see Zulu Time & UTC)
GPWS Ground Proximity Warning System
HBAW Handbook Bulletin for Airworthiness (FAA)
HIWAS Hazardous In-Flight Weather Advisory Service; continuous recorded hazardous in-flight weather forcasts broadcast to airborne pilots over selected VOR outlets defined as an HIWAS Broadcast Area
HSI Horizontal Situation Indicators
ICAO International Civil Aviation Organnisation
IFR Instrument Flight Rules; a set of rules governing the conduct of flight under instrument meteorological conditions
IEP Ice Evidence Probe
ILS Instrument Landing System
IMC Instrument Meteorological Conditions; meteorological conditions expressed in terms of visibility, distance from clouds and ceiling less tan minima specified for visual meteorological condition
Incident An occurence other than an accident associated with the operation of an aircraft, which affects or could affect the safety of operations
Injury The generic term including Non-Fatal Serious Injuries and Fatal Injuries
IOE Initial Operating Experience
JAAIC Japan Aircraft Accident Investigation Commission
KIAS Knots Indicated Airspeed
KTS Knots (Nautical mile per hour)
LPC Low Pressure Compressor
LWC Liquid Water Content; the total mass of water in all the liquid cloud droplets within a unit volume of cloud; LWC/SLW refer to the amount of liquid in a certain volume of air
LWD Left Wing Down
MAC Mean Aerodynamic Chord
McIDAS Man-computer Interactive Data Access System
MDA Minimum Descent Altitude
MED Mean Effective Diameter; of water droplet
MEL Minimum Equipment List
MFC Multi-Function Computer
MLS Microwave Landing System
MMEL Master Minimum Equipment List
MSL Mean Sea Level
MTOW Maximum Take Off Weight
MVD Median Volumetric Diameter; freezing drizzle is defined as supercooled water drops with MVDs between 50 and 300 microns and freezing rain as supercooled water drops with MVDs greater than 300 microns (a micron is 1/1,000 of a millimeter)
("supercooled" is the liquid state of a substance that is below the normal freezing temperature for that substance)
NACA National Advisory Committeee for Aeronautics (now NASA)
NAS Navigational Avoidance System
NASA National Aeronautics and Space Administration (formerly NACA)
NASIP National Aviation Safety Inspection Program
NCAR National Centre for Atmospheric Research
NDB Non-Directional Beacon
NOAA National Oceanic and Atmospheric Administration
NOTAM Notice to Airman
NPRM Notice of Proposed Rulemaking
NRS National Resource Specialist
NTAP National Track Analysis Program
NWS National Weather Service
NAWAU National Aviation Weather Advisory Unit; renamed Aviation Weather Centre
OAT Outside Air Temperature
OB Operational Bulletin
OIM Operators Information Message
PA Public Address; system
PAI Principal Avionics Inspector
PAPI Precision Approach Path Indicator
PAR Precision Approach Radar
PF Pilot Flying
PIC Pilot in Command
PIO Pilot Induced Oscillation
PIREP Pilot Report
PMR Performance Maintenance Recorder
PNF Pilot Not Flying
POI Principal Operations Inspector (FAA)
QNH Corrected mean sea level pressure
RAPCON Radar Approach Control
RIV Rapid Intervention Vehicle
RTF Radiotelephony
Runway Incursion Any occurence at an airport involving an aircraft, vehicle, person, or object on the ground that creates a collision hazard or results in loss of separation with an aircraft taking off, intending to take off, landing or intending to land.
Runway Vicinity An accident is considered to have occured within the Runway Vicinity if egress or injury took place within the area under the control of the airport authorities or within easy reach of the airport firefighting services.
RWD Right Wing Down
SAT Static Air Temperature (synonymous with OAT)
SB Service Bulletin; supplied by manufacturer
SDR Service Difficulty Report
Serious Injury An injury which is sustained by a person in an accident and which :
(a) requires hopitalisation for more than 48 hours, commencing within 7 days from the date the injury was recieved; or
(b) results in a fracture of any bone (except simple fractures of fingers, toes or nose); or
(c) involves lacerations which cause severe haemorrhage, nerve, muscle, or tendon damage; or
(d) involves injury to any internal organ: or
(e) involves secobd or third degree burns, or any burns affecting more than 5% of the bofy surface; or
(f) involves verifed exposure to infectious substances or injurious radiation.
SIGMET Significant Meteorological Information; such advisories to flightcrews include, but are not limited to, severe and extreme turbulence and severe icing
SLD Supercooled Large Droplet
SLW Supercooled Liquis Water
SN Serial Number
SPS Stall Protection System
STC Supplemental Type Certificate
Survivable Accident An accident is considered survivable if at least one occupant survived, or there was potential for occupent survival
TAIC Transport Accident Investigation Commission (New Zealand)
TAT Total Air Temperature
TC Type Certificate
TCAS Traffic Alert And Collision Avoidance System
TN Technical Note
TRACON Terminal Radar Approach Control
TLU Travel Limiter Unit; which limits rudder travel
UAE United Arab Emirates
UTC Co-ordinated universal time (see Zulu Time & GMT)
VMC Visual Meteorological Conditions; expressed in terms of visibility, distance from clouds and ceiling equal to or better than specified minima
VFR Visual Flight Rules; rules that govern the procedures for conducting flight under visual conditions (VMC)
VOR Very High Frequency Omnidirectional Radio; range navigation aid
WSR Weather Surveillance Radar
Zulu Time Co-ordinated universal time (UTC), time at the O' longitude lines that passes through Greenwich, England, and is based on the 24-hour clock
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