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航空術(shù)語(yǔ)詞典Dictionary of Aeronautical Terms 中

時(shí)間：2011-03-11 23:13來(lái)源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次


hover check (helicopter operation). A stabilized hover of a helicopter or VTOL aircraft used to conduct a performance/power check prior to hover taxi, air taxi, or takeoff.
hovering ceiling (helicopter flight). The maximum altitude at which a helicopter can support itself without forward motion. Hovering ceiling is normally given in two figures: in ground effect (IGE) and out of ground effect (OGE).
hovering in ground effect (helicopter operation). A helicopter hovering in ground effect (IGE) is in flight, but it is not moving over the ground, and it is flying at a height equal to or less than the span of its rotor above the surface. A helicopter can hover in ground effect at a higher density altitude than it can hover out of ground effect.
hovering out of ground effect (helicopter operation). A helicopter hovering out of ground effect (OGE) is in flight, but it is not moving over the ground, and it is flying at a height above the ground greater than the span of its rotor.
hover taxi (helicopter operation). Movement of a helicopter or VTOL aircraft above the surface and in ground effect, at airspeeds of less than approximately 20 knots.
HRD fire extinguisher (high-rate-discharge). A fire extinguisher that carries the extinguishing agent in a sealed sphere or cylinder. When the agent-discharged switch is closed, a powder charge drives a cutter through a frangible disk and releases the agent. The entire contents of the container is emptied in much less than a second.
HSI (horizontal situation indicator). An electronic flight and navigation instrument that shows the pilot the proper changes to make in directional flight. An HSI shows the pilot the relationship of he aircraft to the VOR radial or ADF bearing, the magnetic direction, the desired course and heading, and also the relationship of the aircraft to the glide slope.

hub of a propeller. The portion of a propeller that attaches to the propeller shaft of the engine. The propeller blades fasten into the hub.
HUD (head-up display). A special type of flight instrumentation that allows the pilot of an aircraft to watch the instruments while looking ahead of the aircraft for the approach lights or the runway. Head-up displays increase the safety of flight during the transition from instrument flight to visual flight during a landing.
hue (color characteristic). The characteristic of light, caused by its wavelength, that gives a color its name. Red, blue, and green are hues.
humidity. A term used to indicate the presence of water vapor, or moisture, in the air.
hung start (gas turbine engine operation). An improper start of a gas turbine engine in which the engine starts, but fails to accelerate to a self-sustaining speed. See false start.
hunting (automatic flight control system). An undesirable condition in an automatic flight control system in which the system oscillates back and forth on either side of a stable condition. The control system seeks, or hunts for, its stable condition, but each time it approaches it, it overshoots and must seek it again.

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