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MARKER BEACON - An electronic navigation facility transmitting a 75 Megahertz vertical fan or bone shaped radiation pattern. Marker beacons are identified by their modulation frequency and keying code and when received by compatible airborne equipment, indicate to the pilot, both aurally and visually, that he is passing over the facility. (See Outer Marker, Middle Marker, Inner Marker)
MAXIMUM AUTHORIZED ALTITUDE/MAA - A published altitude representing the maximum usable altitude or Flight Level for an airspace structure or route segment. It is the highest altitude on a federal airway, jet route, area navigation low or high route, or other direct route for which a Minimum Enroute Altitude is designated in Federal Air Regulations Part 95, at which adequate reception of navigation aid signals is assured.
MAYDAY (P/CG) - The international radiotelephony distress signal. When repeated three times, it indicates imminent and grave danger and that immediate assistance is requested. (See PAN-PAN)
MAYDAY (JCS) - Distress call.
MEACONING (JCS, NATO) - A system of receiving radio beacon signals and rebroadcasting them on the same frequency to confuse navigation. The meaconing stations cause inaccurate bearings to be obtained by aircraft or ground stations.
METEOROLOGICAL IMPACT STATEMENT/MIS - An unscheduled planning forecast describing conditions expected to begin within 4 to 12 hours which may impact the flow of air traffic in a specific center's (Air Route Traffic Control Center) area.
METERING - A method of time regulating arrival traffic flow into a terminal area so as not to exceed a predetermined terminal acceptance rate.
METERING FIX - A fix along an established route from over which aircraft will be metered prior to entering terminal airspace. Normally, this fix should be established at a distance from the airport which will facilitate a profile descent 10,000 feet above airport elevation (AAE) or above.
MIA - (See Minimum IFR Altitudes)
MICROBURST - A small downburst with outbursts of damaging winds extending 2.5 miles or less. In spite of its small horizontal scale, an intense microburst could induce wind speeds as high as 150 knots.
MICROWAVE LANDING SYSTEM/MLS - A precision instrument approach system operating in the microwave spectrum which normally consist of the follow components:
(1)
Azimuth Station.

(2)
Elevation Station.

(3) Precision Distance Measuring Equipment (See Microwave Landing System Categories).

MIDDLE COMPASS LOCATOR - (See Compass Locator)
MIDDLE MARKER/MM - A marker beacon that defines a point along the glide slope of an Instrument Landing System normally located at or near the point of Decision Height (Instrument Landing System Category I). It is keyed to transmit alternate dots and dashes, with the alternate dots and dashes keyed at the rate of 95 dot/dash combinations per minute, on a 1300 Hertz tone, which is received aurally and visually by compatible airborne equipment. (See Marker Beacon, Instrument Landing System)
MID RVR - (See Visibility)
MIJI - Meaconing, Intrusion, Jamming, and Interference.
MILES-IN-TRAIL - A specified distance between aircraft, normally, in the same stratum associated with the same destination or route of flight.
MILITARY AUTHORITY ASSUMES RESPONSIBILITY FOR SEPARATION OF AIRCRAFT/MARSA - A condition whereby the military services involved assume responsibility for separation between participating military aircraft in the Air Traffic Control system. It is used only for required Instrument Flight Rules operations which are specified in letters of agreement or other appropriate Federal Aviation Administration or military documents.
MILITARY OPERATIONS AREA/MOA - (See Special Use Airspace)
MILITARY TRAINING ROUTES/MTR - Airspace of defined vertical and lateral dimensions established for the conduct of military flight training at airspeeds in excess of 250 knots indicated airspeed. (See Instrument Flight Rules (IR) and Visual Flight Rules (VR) Military Training Routes)
　
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