时间：2011-04-18 00:52来源：蓝天飞行翻译 作者：航空 点击：次
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MINIMUM DESCENT ALTITUDE. The lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering in execution of a Pilot/Controller Glossary standard instrument approach procedure where no electronic glideslope is provided. (See NONPRECISION APPROACH PROCEDURE.)MINIMUM EN ROUTE IFR ALTITUDE (MEA). The lowest published altitude between radio fixes which assures acceptable navigational signal cover-age and meets obstacle clearance requirements between those fixes. The MEA prescribed for a Federal airway or segment thereof, area navigation low or high route, or other direct route applies to the entire width of the airway, segment, or route between the radio fixes defining the airway, segment, or route. (Refer to 14 CFR Part 91.)(Refer to 14 CFR Part 95.)(Refer to AIM.)MINIMUM FRICTION LEVEL. The friction level specified in AC 150/5320-12, Measurement, Construction, and Maintenance of Skid Resistant Airport Pavement Surfaces, that represents the minimum recommended wet pavement surface friction value for any turbojet aircraft engaged in LAHSO. This value will vary with the particular friction measurement equipment used. MINIMUM FUEL. Indicates that an aircraft’s fuel supply has reached a state where, upon reaching the destination, it can accept little or no delay. This is not an emergency situation but merely indicates an emergency situation is possible should any undue delay occur. (Refer to AIM.)MINIMUM HOLDING ALTITUDE. The lowest altitude prescribed for a holding pattern which assures navigational signal coverage, communica-tions, and meets obstacle clearance requirements. MINIMUM IFR ALTITUDES (MIA). Minimum altitudes for IFR operations as prescribed in 14 CFR Part 91. These altitudes are published on aeronautical charts and prescribed in 14 CFR Part 95 for airways and routes, and in 14 CFR Part 97 for standard instrument approach procedures. If no applicable minimum altitude is prescribed in 14 CFR Part 95 or 14 CFR Part 97, the following minimum IFR altitude applies: a. In designated mountainous areas, 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown; or PCG M.3 b.Other than mountainous areas, 1,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown; or c.As otherwise authorized by the Administrator or assigned by ATC. (See MINIMUM CROSSING ALTITUDE.)(See MINIMUM EN ROUTE IFR ALTITUDE.)(See MINIMUM OBSTRUCTION CLEARANCE ALTITUDE.)(See MINIMUM SAFE ALTITUDE.)(See MINIMUM VECTORING ALTITUDE.)(Refer to 14 CFR Part 91.)MINIMUM NAVIGATION PERFORMANCE SPECIFICATION. A set of standards which require aircraft to have a minimum navigation performance capability in order to operate in MNPS designated airspace. In addition, aircraft must be certified by their State of Registry for MNPS operation. MINIMUM NAVIGATION PERFORMANCE SPECIFICATION AIRSPACE. Designated airspace in which MNPS procedures are applied between MNPS certified and equipped aircraft. Under certain conditions, non-MNPS aircraft can operate in MNPSA. However, standard oceanic separation minima is provided between the non-MNPS aircraft and other traffic. Currently, the only designated MNPSA is described as follows: a.Between FL 285 and FL 420; b.Between latitudes 270N and the North Pole; c.In the east, the eastern boundaries of the CTAs Santa Maria Oceanic, Shanwick Oceanic, and Reykjavik; d.In the west, the western boundaries of CTAs Reykjavik and Gander Oceanic and New York Oceanic excluding the area west of 600W and south of 38030’N. MINIMUM OBSTRUCTION CLEARANCE ALTI-TUDE (MOCA). The lowest published altitude in effect between radio fixes on VOR airways, off-airway routes, or route segments which meets obstacle clearance requirements for the entire route segment and which assures acceptable navigational signal coverage only within 25 statute (22 nautical) miles of a VOR. (Refer to 14 CFR Part 91.)(Refer to 14 CFR Part 95.)MINIMUM RECEPTION ALTITUDE. The lowest altitude at which an intersection can be determined. (Refer to 14 CFR Part 95.)MINIMUM SAFE ALTITUDE. a.The minimum altitude specified in 14 CFR Part 91 for various aircraft operations. b.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 predicated. These altitudes will be identified as Minimum Sector Altitudes or Emergency Safe Altitudes and are established as follows: 1.Minimum Sector Altitudes. Altitudes de-picted 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. (See ICAO term Minimum Sector Altitude.)2.Emergency Safe Altitudes. Altitudes de-picted on approach charts which provide at least 1,000 feet of obstacle clearance in nonmountainous areas and 2,000 feet of obstacle clearance in designated mountainous areas within a 100-mile radius of the navigation facility upon which the procedure is predicated and normally used only in military procedures. These altitudes are identified on published procedures as “Emergency Safe Alti-tudes.” MINIMUM SAFE ALTITUDE WARNING. A function of the ARTS III computer that aids the controller by alerting him/her when a tracked Mode C equipped aircraft is below or is predicted by the computer to go below a predetermined minimum safe altitude. (Refer to AIM.) |
