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Aviation
Dealing with vehicles or machines used in flight or propulsion through the air.
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Aviation > Aircraft 
height above airport (HAA)
Aviation; Aircraft
The height of the MDA above the published airport elevation.
significant meteorological information (SIGMET)
Aviation; Aircraft
A weather advisory issued concerning weather significant to the safety of all aircraft.
adiabatic cooling
Aviation; Aircraft
A process of cooling the air through expansion. For example, as air moves up slope it expands with the reduction of atmospheric pressure and cools as it expands.
height above landing (HAL)
Aviation; Aircraft
The height above a designated helicopter landing area used for helicopter instrument approach procedures.
significant weather prognostic
Aviation; Aircraft
Presents four panels showing forecast significant weather.
adiabatic heating
Aviation; Aircraft
A process of heating dry air through compression. For example, as air moves down a slope it is compressed, which results in an increase in temperature.
height above touchdown elevation (HAT)
Aviation; Aircraft
The DA/DH or MDA above the highest runway elevation in the touchdown zone (first 3,000 feet of the runway).
Sub-categories
- Aeronautics (18944)
- Air traffic control (14233)
- Aircraft (22883)
- Aircraft maintenance (1634)
- Airframe (736)
- Airline (2189)
- Airplane flying (18062)
- Airplanes & equipment (4488)
- Airport (11900)
- Avionics (154)
- General aviation (1759)
- Helicopter (80)
- Jet engines (2630)
- Powerplant (618)