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MINIMUM CROSSING ALTITUDE/MCA - The lowest altitude at certain fixes at which an aircraft must cross when proceeding in the direction of a higher Minimum Enroute Instrument Flight Rules Altitude (MEA). (See Minimum Enroute IFR Altitude)
MINIMUM DESCENT ALTITUDE/MDA (P/CG) - The lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuver in execution of a standard instrument approach procedure where no electronic glide slope is provided. (See Nonprecision Approach Procedure)
MINIMUM DESCENT ALTITUDE (JCS, NATO) - The lowest altitude to which descent shall be authorized in procedures not using a glide slope, until the required visual reference has been established.
MINIMUM ENROUTE IFR ALTITUDE/MEA -The lowest published altitude between radio fixes which assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes. The Minimum Enroute Altitude 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 Federal Air Regulations Parts 91 and 95)
MINIMUM FLIGHT ALTITUDE/MFA (NGA) - A Minimum Flight Altitude is normally the lower vertical limit of an ATS route. FLIP Enroute Charts that require the depiction of vertical limits along an ATS route segment will not be required to show any additional MFA value (unless a host nation publishes an MFA higher than the lower vertical limit). Charts requiring the depiction of the MFA value only, will publish the lower limits of the ATS route (or the host country MFA) as the MFA. If a host country does not publish or provide NGA with an ATS route vertical limit or MFA, then NGA will compute and publish a MFA assuring 3000' terrain clearance within 5 NM of the ATS route centerline.
NOTE: The NGA MFA value will be preceded by a pound number sign (#) to indicate NGA derived MFA.
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.
MINIMUM HOLDING ALTITUDE/MHA - The lowest altitude prescribed for a holding pattern which assures navigational signal coverage, communications, and meets obstacle clearance requirements.
MINIMUM IFR ALTITUDES/MIA - Minimum altitude for Instrument Flight Rules operations as prescribed in Federal Air Regulations Part 91. These altitudes are published on aeronautical charts and prescribed in Federal Air Regulations Part 95, for airways and routes, and in Federal Air Regulations Part 97, for standard Instrument Approach Procedures. If no applicable minimum altitude is prescribed in Federal Air Regulations Parts 95 or 97, the following minimum IFR altitude applies:
(1)
In mountainous areas, 2000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown; or

(2)
Other than mountainous areas, 1000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown; or

(3)
As otherwise authorized by the Administrator or assigned by Air Traffic Control. (See Minimum Narrate IFR Altitude, Minimum Obstruction Clearance Altitude, Minimum Crossing Altitude, Minimum Safe Altitude, Minimum Vectoring Altitude) (Refer to Federal Air Regulations Part 91)

(SPEC/Pilot-Controller Glossary & FAR 91.177)

MINIMUM NAVIGATION PERFORMANCE SPECIFICATIONS AIRSPACE (IFIM) - A concept adopted by ICAO with the objective of ensuring safe separation of aircraft and maximum benefit from required navigation equipment.
MINIMUM OBSTRUCTION CLEARANCE ALTITUDE/MOCA (P.CG, JCS) - 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 navigation signal coverage only within 25 statue miles (22 nautical miles) of a VOR. (Refer to Federal Air Regulations Part 91 and 95)
　
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