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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


holding relay. An electrical relay whose coil is in series with its contacts. The contacts are closed by sending a pulse of current through the coil, and the contacts remain closed until the current flowing through them is interrupted.
hold-short point (air traffic control). A point on the runway beyond which a landing aircraft with a land and hold short (LAHSO) clearance is not authorized to proceed. The hold-short point may be located prior to an intersecting runway, taxiway, predetermined point, or approach/departure flight path.
hold-short position lights (air traffic control). Flashing in-pavement white lights located at specific hold-short points.
hold-short position marking (air traffic control). The painted runway marking located at the hold-short point on all land and hold short (LAHSO) runways.
hold-short position signs (air traffic control). Red and white holding position signs located alongside the hold-short point.
hole (semiconductor device). A concept used to explain the action that takes place in a semiconductor material. A hole is a location in a covalent atomic bond where there should be an electron, but where there is none.
Holes are the mobile charges in a piece of P-type semiconductor material, and since they are located where an electron (a negative charge) should be, they act as positive charges. See acceptor atom.

hole finder (sheet metal hand tool). A hand tool used in sheet metalwork that allows a technician to locate a rivet hole in a new sheet metal skin so the hole will be directly in line with a hole already existing in the structure being repaired.
The tool consists of a drill guide directly in line with a pilot pin and space for the undrilled skin to slip between the guide and the pin. The tool is slipped over the edge of the skin and the pilot pin inserted in the existing rivet hole. A hole drilled through the drill guide is directly in line with the existing rivet hole.

hollow drill. A drill with a hole through its center. Air or liquid lubricant can be pumped through a hollow drill into the hole being drilled, to make it easier for the drill to cut, and to remove chips from the hole.
holmium. A relatively soft, malleable, stable, rare-earth chemical element. Holmium’s symbol is Ho, its atomic number is 67, and its atomic weight is 164.93. Holmium has a melting point of around 1,500°C.
homebuilt aircraft. Aircraft that are built by individuals as a hobby rather than by factories as commercial products. Homebuilt, or amateur-built, aircraft are not required to meet the stringent requirements imposed on the manufacturer of FAA-certificated aircraft.
homing (aircraft flight). Flight toward a navaid without a wind correction being applied. This is done by adjusting the aircraft heading to maintain a relative bearing of zero degrees between the navaid and the nose of the aircraft.
hone. A fine abrasive stone. Hones are used to sharpen cutting tools and to smooth a surface by wearing away surface roughness.

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