时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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MS flareless fittings. Fluid-line fittings that form their seal with a ferrule around the tubing rather than with a flare. MSL (mean sea level). The datum used as a reference for measuring elevations throughout the United States. It is the average height of the surface of the sea for all stages of tide. When the letters MSL are used with an altitude, it means that the altitude measured from mean, or average, sea level. MTBF (mean time between failures). A statistical measure of the average length of time between successive system failures. MTI (moving target indicator). An electronic device which causes a radar scope to show only targets which are in motion. An MTI is a partial remedy for ground clutter. MTR (military training routes). Airspace of defined vertical and lateral dimensions, established for the conduct of military training at airspeeds in excess of 250 knots IAS. muff (heater). A thin sheet metal shroud that wraps around the exhaust stack or the muffler of a reciprocating engine to pick up heat. Ventilating air blows through the muff and carries the heat it picks up into the cabin. mule (hydraulic power supply). An auxiliary power supply that can be connected to an aircraft to supply fluid under pressure to the hydraulic system when the engines are not operating. Mules supply hydraulic pressure to an aircraft to perform the landing gear retraction test when the aircraft is up on jacks. MULTICOM (air traffic control). A mobile service not open to public correspondence, used to provide communications essential to conduct the activities being performed by or directed from private aircraft. multimeter (electrical test equipment). An electrical measuring instrument that uses a single current-measuring meter and the necessary components to measure several ranges of voltage, current, and resistance. The different functions and ranges are selected by switches or by jacks into which test leads are plugged. Multimeters are often called VOMs, because they are able to measure volts, ohms, and milliamps. Multimeters with a digital readout are called DVOMs. multiple-can combustor (turbine engine component). A combustor used in a gas turbine engine that consists of a series of individual burner cans, each of which consists of an inner liner and an outer case. The individual cans are arranged around the periphery of a centrifugal compressor. The hot gases flow directly from the cans into the turbine. multiple-disk brake. A form of aircraft brake in which a series of metal or carbon disks keyed to slots inside the wheel rotate between a series of fixed disks keyed to the axle on which the wheel is mounted. Pistons in a series of hydraulic cylinders produce a force that clamps the rotating disks between the fixed disks. This produces enough friction to slow or stop the aircraft on which the brake is installed. multiple runways (air traffic control). The utilization of dedicated arrival runway(s) for departures and a dedicated departure runway(s) for arrivals, when feasible to reduce delays and enhance capacity. |
