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时间:2011-08-13 12:47来源:蓝天飞行翻译 作者:航空
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MINIMUM RECEPTION ALTITUDE/MRA (P/CG) - The lowest altitude at which an intersection can be determined. (Refer to Federal Air Regulations Part 95)
MINIMUM RECEPTION ALTITUDE (JCS) - The lowest altitude required to receive adequate signals to determine specific VHF omnirange/tactical air navigation fixes.
MINIMUM SAFE ALTITUDE/MSA (P/CG) -
(1) The minimum altitude specified in Federal Air Regulations Part 91, for various aircraft operations.
(2) Altitudes depicted on approach charts which
provide at least 1000 feet of obstacle clearance for emergency use within a specified distance from the navigation facility upon which a procedure is predicated. These altitudes will be identified as Minimum Sector Altitude or Emergency Safe Altitude and are established as follows:
(a)
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 degrees in scope. These altitudes are for emergency use only and do not necessarily assure acceptable navigational signal coverage.

(b)
EMERGENCY SAFE ALTITUDES - Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance in non-mountainous areas and 2,000 feet of obstacle clearance in designated mountainous areas within a 100-mile radius of the navigational facility upon which the procedure is predicated and normally used only in military procedures. These altitudes are identified on published procedures as "Emergency Safe Altitudes".


MINIMUM SAFE ALTITUDE (JCS, NATO) - The altitude below which it is hazardous to fly, owing to presence of high ground or other obstacles.
MINIMUM SAFE ALTITUDE WARNING (MSAW) - A function of the Automated Radar Terminal Systems 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.
MINIMUM SECTOR ALTITUDES (P/CG) - (See Minimum Safe Altitude/MSA (P/CG)).
MINIMUM SECTOR ALTITUDE (ICAO) - The lowest altitude which may be used under emergency conditions which will provide a minimum clearance of 300 meters (1000 feet) above all obstacles located in an area contained within a sector of a circle of 25 nautical miles radius centered on a radio aid to navigation.
MINIMUM VECTORING ALTITUDE/MVA - The lowest mean sea level altitude at which an IFR aircraft will be vectored by a radar controller, except as otherwise authorized for radar approaches, departures and missed approaches. The altitude meets Instrument Flight Rules obstacle clearance criteria. It may be lower than the published Minimum Enroute Altitude along an airway or J-route segment. It may be utilized for radar vectoring only upon the controllers' determination that an adequate radar return is being received from the aircraft being controlled. Charts depicting minimum vectoring altitudes are normally available only to the controllers and not to pilots.
MINIMUMS/MINIMA - Weather condition requirements established for a particular operation or type of operation; e.g., Instrument Flight Rules take-off or landing, alternate airport for Instrument Flight Rules flight plans, Visual Flight Rules flight. (See Landing minimum, Instrument Flight Rules Take-off minimums, Visual Flight Rules conditions, Instrument Flight Rules conditions) (Refer to Federal Air Regulations Part 91)
MINUTES-IN-TRAIL - A specified interval between aircraft expressed in time. This method would more likely be utilized regardless of altitude.
MISSED APPROACH (P/CG) -
(1)
A maneuver conducted by a pilot when an instrument approach cannot be completed to a landing. The route of flight and altitude are shown on instrument approach procedure charts. A pilot executing a missed approach prior to the missed approach point (MAP) must continue along the final approach to the MAP. The pilot may climb immediately to the altitude specified in the missed approach procedure.
 
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