| A |
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| AAIB |
Air Accident Investigation Branch: British equivalent of NTSB |
| ACARS |
Aircraft Communications Addressing and Reporting System |
| ACAS |
Aircraft Collision Avoidance System |
| ADF |
Automatic Direction Finder: a navigation receiver |
| ADS-B |
Automatic Dependent Surveillance: Broadcast |
| Altitude Indicator |
Indicates aircraft altitude or height from sea level. Must be calibrated for local atmospheric pressure. |
| Attidtude Indicator |
(Artificial Horizon) Shows if aircraft is in level flight. Usually indicated by wings on a horizontal line. |
| APU |
Auxiliary Power Unit |
| ATC |
Air Traffic Control |
| ATIS |
Automated Terminal Information Service |
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| C |
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| CTAF |
Common Traffic Advisory Frequency |
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| D |
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| DME |
Distance Measuring Equipment |
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| E |
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| EPIRB |
Emergency Position Indicating Radio Beacon |
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| F |
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| Flight Plan |
Aircraft will follow this route. Can contain multiple legs. Sumbmitted before flight. |
| Flight Planned Route |
Aircraft follows the FLIGHT PLAN there may be minor deviations but aircraft eventually resumes the FLIGHT PLANNED ROUTE. |
| FLIR |
Forward Looking Infra-Red (radar) |
| FMC |
Flight Management Computer |
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| G |
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| GNSS |
Global Navigation Satellite System |
| Go Around |
Aborted landing. Wheels do not contact with the ground. Aircraft climbs away under power. |
| GPS |
Global Positioning System. |
| GPWS |
Ground Proximity Warning System |
| GS |
Ground Speed. Calculated from speed indicator adjustment. |
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| H |
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| HF |
High Frequency (Radio) 3mHz to 30mHz |
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| I |
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| IAS |
Indicated Air Speed. Usually diminishes with altitude. (See Ground Speed). |
| ICAO |
International Civil Aviation Organization: agency of the UN |
| ILS |
Instrument Landing System |
| IMC |
Instrument Meteorological Conditions (see IFR) |
| Inmarsat |
International Maritime Satellite Organization |
| INS |
Inertial Navigation System |
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| K |
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| KT |
Knots: nautical miles/hour |
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| L |
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| LOC |
Localizer: part of Instrument Landing System (ILS). Located on ground at far end of runway. Provides runway centreline information to aircraft
(See Gallery: HERE) |
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| M |
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| M |
Mach number: speed of a/c expressed in relation to speed of sound |
