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HAA: Height Above Airport, the height of the MDA (Minimum Descent Altitude) above the published airport altitude
HAT: Height Above Touchdown, the height of the DH (Decision Height) or MDA (Minimum Descent Altitude) above the highest runway elevation in the TDZ (Touchdown Zone)

HEAT: High Explosive Anti-Tank, a shaped charge munition designed to penetrate armor with a high speed jet of molten metal. Usually used in the context of tank-borne munitions but may be also refer to airborne cannon.

HEAVY: An aircraft capable of takeoff weight of 300,000 pounds or more

HESH: High Explosive Squash Head, a kind of low speed armor-defeating munition that causes spalling off the inner surface of an armor layer.

HF: High Frequency, the radio frequency band between 3 and 30 MHz

HIWAS: Hazardous Inflight Weather Advisory Service, continuous recorded hazardous weather information broadcast over certain VOR stations

HOLD: A procedure in which a plane flies a racetrack shaped pattern relative to a fix while awaiting clearance to proceed


HOOK: Jargon for "tail hook".

HOT START: An unwanted turbine engine start condition in which raw fuel pools in the engine and burns as open flames. May necessitate an engine hot section teardown.

HOT SECTION: The combustion chamber(s) of a turbine engine along with its supporting components.

HOWGOZIT: A flight engineer's fuel status and fuel rate of consumption report.

HSI: Horizontal Situation Indicator, an instrument combining VOR, ADF, heading control and compass functions.

HYDROPLANING: A wheel skid condition caused by an unbroken film of water between a tire and the pavement on which the tire is rolling, resulting in brakes "lock up". Overcome by grooving the pavement.

HUNG START: See "rpm hang-up".

HUSH KIT: A turbine engine upgrade kit for reducing the engine's noise output.


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