![]() ![]() METER FIX ARC- A semicircle, equidistant from a meter fix, usually in low altitude relatively close to the meter fix, used to help TBFM/ERAM calculate a meter time, and determine appropriate sector meter list assignments for aircraft not on an established arrival route or assigned a meter fix. METEOROLOGICAL IMPACT STATEMENT- 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 (ARTCC) area. (See MICRO-EN ROUTE AUTOMATED RADAR TRACKING SYSTEM.) When repeated three times, it indicates imminent and grave danger and that immediate assistance is requested. MAYDAY- The international radiotelephony distress signal. MAXIMUM GROSS OPERATING WEIGHT (MGOW)- The maximum gross weight of an aircraft, including fuel and any external objects, at any point during the flight. It is the highest altitude on a Federal airway, jet route, area navigation low or high route, or other direct route for which an MEA is designated in 14 CFR Part 95 at which adequate reception of navigation aid signals is assured. MAXIMUM AUTHORIZED ALTITUDE- A published altitude representing the maximum usable altitude or flight level for an airspace structure or route segment. (See MILITARY AUTHORITY ASSUMES RESPONSIBILITY FOR SEPARATION OF AIRCRAFT.) 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/she is passing over the facility. MARKER BEACON- An electronic navigation facility transmitting a 75 MHz vertical fan or boneshaped radiation pattern. MANDATORY ALTITUDE- An altitude depicted on an instrument Approach Procedure Chart requiring the aircraft to maintain altitude at the depicted value. Although the weapons have limited range, and their accuracy is affected by poor visibility and adverse weather, they can be fired from anywhere on land or from boats where there is unrestricted visibility to the target. Terrorists choose MANPADS because the weapons are low cost, highly mobile, require minimal set-up time, and are easy to use and maintain. The potential for MANPADS use against airborne aircraft is real and requires familiarity with the subject. MAN PORTABLE AIR DEFENSE SYSTEMS (MANPADS)- MANPADS are lightweight, shoulder-launched, missile systems used to bring down aircraft and create mass casualties. MAKE SHORT APPROACH- Used by ATC to inform a pilot to alter his/her traffic pattern so as to make a short final approach. This value will vary depending on the particular friction measurement equipment used. ![]() MAINTENANCE PLANNING FRICTION LEVEL- The friction level specified in AC 150/5320-12, Measurement, Construction, and Maintenance of Skid Resistant Airport Pavement Surfaces, which represents the friction value below which the runway pavement surface remains acceptable for any category or class of aircraft operations but which is beginning to show signs of deterioration. The phrase “climb and” or “descend and” normally precedes “maintain” and the altitude assignment e.g., “descend and maintain 5,000.”Ĭoncerning other ATC instructions, the term is used in its literal sense e.g., maintain VFR. The principle objective is to achieve improved utilization of the airspace and to ensure that separation between successive aircraft does not decrease below the established minima.Ĭoncerning altitude/flight level, the term means to remain at the altitude/flight level specified. MACH TECHNIQUE - Describes a control technique used by air traffic control whereby turbojet aircraft operating successively along suitable routes are cleared to maintain appropriate MACH numbers for a relevant portion of the en route phase of flight. MACH NUMBER- The ratio of true airspeed to the speed of sound e.g., MACH. ![]()
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