航空术语词典Dictionary of Aeronautical Terms 中

时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次

mare’s tail (meteorology). A cirrus cloud with a curve on one end and a long flowing tail on the other.
marine grommet (aircraft fabric covering component). A small plastic or metal reinforcing ring attached to the fabric covering at low points in the structure and at the trailing edges of the wing and tail surfaces. Grommets are used to reinforce the drain or vent holes cut in the fabric at these locations. A marine grommet, also called a seaplane grommet, differs from ordinary grommets because of a shield placed over the hole. This shield keeps the spray during takeoff and landing from getting into the structure.
marker beacon (radio navigation equipment). A low-powered, 75-MHz, fixed-frequency radio transmitter that directs its signal vertically upward in a small, fan-shaped pattern. Marker beacons are located along the flight path used when approaching an airport for landing, and are identified by their modulation frequency and keying code. When received by compatible airborne equipment, marker beacons indicate to the pilot, both aurally and visually, when the aircraft is directly over the facility.
When the aircraft is directly above the outer marker the pilot hears a series of 400-hertz dashes and the blue light illuminates in the series of dashes. Over the middle marker, the amber light illuminates in a series of alternate dots and dashes and the aural tone is a series of 1,300-hertz dots and dashes. The inner marker is identified by the white light illuminating in a series of dots and a series of 3,000-hertz dots is heard by the pilot.

married needles (helicopter operation). The needles (pointers) of a dual tachometer indicator installed in a helicopter are said to “married” when one needle is exactly on top of the other.
One needle is driven by a tachometer generator on the engine and the other by a generator on the transmission that senses the speed of the rotor. When the rotor-drive clutch is fully engaged and there is no slippage, the needles are married.
Martin clip (fabric covering component). A patented wire clip used to attach aircraft fabric to the wing ribs. A Martin clip is long piece of spring steel wire with a series of hooks bent into it at each location the fabric should be attached to the rib cap strip. The hooks are pressed through small slits in the reinforcing tape and the fabric and through elongated holes in the rib cap strips. The hooks lock the clip in the holes and pull the fabric tight against the cap strip.
The use of Martin clips rather than rib stitching saves a tremendous amount of time when covering an aircraft surface.

masking tape. Paper tape with a pressure-sensitive adhesive on one side. Masking tape has a wrinkled texture so it will lie smoothly around a curve, and the adhesive is easily removed from a properly prepared surface. Masking tape is used to fasten paper to parts of a surface being painted, to prevent the paint from reaching certain areas.
Masonite. The registered trade name for a type of fiberboard. Masonite is made by exploding wood chips in a steam gun to break them into long, individual fibers. These fibers are bonded together with lignin (a natural adhesive in the original wood) to make a smooth, grainless sheet of material that can be used for insulation, partitions, etc.

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