| AD
| Aerodrome
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| ADF
| Automatic direction finder/finding. Radio compass which gives a relative bearing to the non-directional radio beacon to which it is tuned.
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| AGL
| Above Ground Level
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| AH
| Artificial Horizon
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| Aileron
| Control surfaces on the trailing edge of the wing. Ailerons on either wing deflect in opposite directions to control the roll of the aircraft. A pilot can control the ailerons by moving the control column to the left or right like a car steering wheel or pushing the the joystick left or right for aircraft with joysticks.
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| AIP
| Aeronautical Information Publication
Aeronautical Information Publication (AIP) Australia consists of a package of douments which provide all the operational information necessary for the safe and efficient conduct of national (civil) and international air navigation throughout Australia and its Territories.
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| Alternate
| Aerodrome on a flight plan that a pilot may elect to divert to in the event that landing at the intended destination is not possible.
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| Altimeter
| A pressure-sensing instrument that displays the altitude of an aircraft above the mean sea level (MSL). A sub-scale on the altimeter allows the pilot to set the QNH so that the altimeter is calibrated for changes in air pressure due to weather.
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| Altitude
| The height expressed in feet above mean sea level or above the ground level.
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| Attitude
| An aircraft's position in relation to the horizon (ie. whether the aircraft is flying level, nose up, nose down, or banking left or right)
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| AOPA
| Aircraft Owners and Pilots Association (of Australia)
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| ATC
| Air Traffic Control
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| ATIS
| Automatic Terminal Information Service.
The ATIS is a continuous recorded broadcast of routine non-control airport information that includes information on the weather and active runways.
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| ATPL
| Air Transport Pilot's License - needed to act as pilot-in-command of a commercial air transport aircraft exceeding 20,000Kg weight.
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| ATSB
| Australian Transport Safety Bureau
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| AUW
| All-Up Weight. A term for the total loaded weight of an aircraft, made up of the empty weight plus load (including fuel).
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| Avgas
| Aviation gasoline, usually followed by the octane rating. Used by piston-engine aircraft and is blue or green in colour. A postfix to the octane rating of LL indicates Low Lead.
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| Avtur
| Aviation turbine fuel (kerosene). Used by turboprops and jets. Jet A1
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