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

motion. Movement, the process in which objects change their position or location.
motor (verb). The act of rotating a turbine engine using the starter with the ignition system deactivated. An engine is motored to force air through it to purge it of fuel fumes.
mountain wave (meteorology). A standing wave or lee wave on the lee, or downwind, side of a mountain barrier.
movement area (air traffic control). The runways, taxiways, and other areas of an airport/heliport which are utilized for taxiing, hover taxiing, air taxiing, takeoff, and landing of aircraft, exclusive of loading ramps and parking areas.
moving-coil meter movement (electrical instrument). An instrument that measures the current flowing through a coil mounted and free to rotate within a magnetic field. The deflection of the coil is proportional to the amount of current flowing through it. Moving-coil meters are normally called D’Arsonval meters.
moving target indicator. See MTI.
MRA (minimum reception altitude). The lowest altitude at which an airway intersection can be determined.
MSA (minimum safe altitude). The minimum altitude specified in 14 CFR Part 91 for various aircraft operations, or altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance for emergency use within a specified distance from the navigation facility upon which a procedure is prescribed. These altitudes are:
1.
Minimum Sector Altitudes: Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance within a 25-mile radius of the navigation facility upon which the procedure is predicated.

Sectors depicted on approach charts must be at least 90° in scope. These altitudes are for emergency use only and do not necessarily assure acceptable navigational signal coverage.

2.
Emergency Safe Altitudes: Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance in nonmountainous areas and 2,000 feet in designated mountainous areas within a 100-mile radius of the navigation facility upon which the procedure is based and normally used only in military procedures.

MSAW (minimum safe altitude warning). A function of the ARTS III computer that aids the controller by alerting him when a tracked Mode C-equipped aircraft is below, or is predicted by the computer to go below, a predetermined minimum safe altitude.
MSB (most significant bit). The bit in a binary number that has the highest place value. The MSB is the bit on the extreme left.
MSD (most significant digit). The digit in a decimal number that has the highest place value. The MSD is the digit on the extreme left.
MSDS (material safety data sheets). Documents relating to hazardous materials that contain information on health precautions, flammability, ventilation requirements, and information for health professionals in case of an accident. MSDS are furnished with all hazardous materials and are required by law to be available to all personnel working with the material.

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