Order 7110.65P, Air Traffic Control, with changes

2/17/05Pilot/Controller GlossaryMIDDLE MARKER− A marker beacon that definesa point along the glideslope of an ILS normallylocated at or near the point of decision height (ILSCategory I). It is keyed to transmit alternate dots anddashes, with the alternate dots and dashes keyed at therate of 95 dot/dash combinations per minute on a1300 Hz tone, which is received aurally and visuallyby compatible airborne equipment.(See INSTRUMENT LANDING SYSTEM.)(See MARKER BEACON.)(Refer to AIM.)MILES-IN-TRAIL− A specified distance betweenaircraft, normally, in the same stratum associatedwith the same destination or route of flight.MILITARY AUTHORITY ASSUMES RESPONSI-BILITY FOR SEPARATION OF AIRCRAFT− Acondition whereby the military services involvedassume responsibility for separation between participatingmilitary aircraft in the ATC system. It is usedonly for required IFR operations which are specifiedin letters of agreement or other appropriate FAA ormilitary documents.MILITARY LANDING ZONE− A landing strip usedexclusively by the military for training. A militarylanding zone does not carry a runway designation.MILITARY OPERATIONS AREA−(See SPECIAL USE AIRSPACE.)MILITARY TRAINING ROUTES− Airspace ofdefined vertical and lateral dimensions establishedfor the conduct of military flight training at airspeedsin excess of 250 knots IAS.(See IFR MILITARY TRAINING ROUTES.)(See VFR MILITARY TRAINING ROUTES.)MINIMA−(See MINIMUMS.)MINIMUM CROSSING ALTITUDE− The lowestaltitude at certain fixes at which an aircraft must crosswhen proceeding in the direction of a higher minimumen route IFR altitude (MEA).(See MINIMUM EN ROUTE IFR ALTITUDE.)MINIMUM DESCENT ALTITUDE− The lowestaltitude, expressed in feet above mean sea level, towhich descent is authorized on final approach orduring circle-to-land maneuvering in execution of astandard instrument approach procedure where noelectronic glideslope is provided.(See NONPRECISION APPROACHPROCEDURE.)MINIMUM EN ROUTE IFR ALTITUDE− Thelowest published altitude between radio fixes whichassures acceptable navigational signal coverage andmeets obstacle clearance requirements between thosefixes. The MEA prescribed for a Federal airway orsegment thereof, area navigation low or high route, orother direct route applies to the entire width of theairway, segment, or route between the radio fixesdefining 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 levelspecified in AC 150/5320-12, Measurement,Construction, and Maintenance of Skid ResistantAirport Pavement Surfaces, that represents theminimum recommended wet pavement surface frictionvalue for any turbojet aircraft engaged inLAHSO. This value will vary with the particularfriction measurement equipment used.MINIMUM FUEL− Indicates that an aircraft’s fuelsupply has reached a state where, upon reaching thedestination, it can accept little or no delay. This is notan emergency situation but merely indicates anemergency situation is possible should any unduedelay occur.(Refer to AIM.)MINIMUM HOLDING ALTITUDE− The lowestaltitude prescribed for a holding pattern whichassures navigational signal coverage, communications,and meets obstacle clearance requirements.MINIMUM IFR ALTITUDES− Minimum altitudesfor IFR operations as prescribed in 14 CFR Part 91.These altitudes are published on aeronautical chartsand prescribed in 14 CFR Part 95 for airways androutes, and in 14 CFR Part 97 for standard instrumentapproach procedures. If no applicable minimumaltitude is prescribed in 14 CFR Part 95 or14 CFR Part 97, the following minimum IFR altitudeapplies:a. In designated mountainous areas, 2,000 feetabove the highest obstacle within a horizontaldistance of 4 nautical miles from the course to beflown; orPCG M−3