時間：2011-03-11 23:13來源：藍(lán)天飛行翻譯 作者：admin 點擊：次
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magnetosphere. The outer layer of the earth’s atmosphere. The magnetosphere starts about a thousand miles above the earth and is the beginning of interplanetary space. The magnetic field of the earth traps charged particles in the magnetosphere. magnetostriction. The characteristic of certain ferromagnetic materials (magnetic materials containing iron) that causes them to change their physical size when they are subjected to a magnetic field. Magnetostriction is used in some types of transducers (devices that change electrical signals into physical movement). If a bar of magnetostrictive material is used as the core of a coil through which alternating current is flowing, the changing magnetic field produced by the AC causes the magnetostrictive bar to change its size enough that it will vibrate an object attached to it. magnetron. A special electron tube used to produce high-power electromagnetic energy in the ultrahigh and superhigh frequency ranges. Magnetron tubes are used in airborne radar equipment. magnet wire. The common name for small diameter, varnish-insulated, annealed copper wire. Magnet wire is used for winding coils for electromagnets, transformers, motors, and generators. magnitude of a force. A quantitative measure of the amount of a force. main rotor. 14 CFR Part 1: “The rotor that supplies the principal lift to a rotorcraft.” maintenance. The upkeep of equipment. Mechanical and electrical equipment must be periodically inspected, to be sure it performs as it was designed and built to perform. When it begins to fail, correct maintenance will usually prevent the problem becoming major. In addition to inspection, maintenance includes adjustments, lubrication, and the replacement of parts to keep the equipment operating as it should. 14 CFR Part 1: “Inspection, overhaul, repair, preservation, and the replacement of parts, but excludes preventive maintenance.” maintenance checks (letter checks). A classification of maintenance inspections or checks used in airline operation. A-check. A thorough visual inspection and an operational check of all major systems of the airframe and engine. B-check. A complete A-check and a more detailed check of certain systems specified for the particular aircraft. C-check. Complete A and B checks with more in-depth inspection of certain systems. A C-check may include a flight check. D-check. The most in-depth inspection of the aircraft. It requires removal of such components as engines and landing gear. maintenance manual. A set of detailed instructions issued by the manufacturer of an aircraft, engine, or component that describes the way maintenance of the device should be performed. Maintenance manuals for certificated aircraft and their components are approved by the Federal Aviation Administration and may be used as approved data when making repairs. maintenance release. A release, signed by an authorized inspector or AMT, signifying that an aircraft has been approved for return to service after certain maintenance functions have been completed. It is also a statement made by an Approved Repair Station in lieu of a Form 337 that approves a product for return to service after a major repair. |
