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Pilot/Controller Glossary

3/29/18

PCG M−3

1300 Hz tone, which is received aurally and visually

by compatible airborne equipment.

(See INSTRUMENT LANDING SYSTEM.)
(See MARKER BEACON.)
(Refer to AIM.)

MILES-IN-TRAIL− A specified distance between

aircraft, normally, in the same stratum associated

with the same destination or route of flight.

MILITARY AUTHORITY ASSUMES RESPONSI-

BILITY FOR SEPARATION OF AIRCRAFT

(MARSA)− A condition whereby the military

services involved assume responsibility for separa-

tion between participating military aircraft in the

ATC system. It is used only for required IFR

operations which are specified in letters of agreement

or other appropriate FAA or military documents.

MILITARY LANDING ZONE− A landing strip used

exclusively by the military for training. A military

landing zone does not carry a runway designation.

MILITARY OPERATIONS AREA−

(See SPECIAL USE AIRSPACE.)

MILITARY TRAINING ROUTES− Airspace of

defined vertical and lateral dimensions established

for the conduct of military flight training at airspeeds

in excess of 250 knots IAS.

(See IFR MILITARY TRAINING ROUTES.)
(See VFR MILITARY TRAINING ROUTES.)

MINIMA−

(See MINIMUMS.)

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 en route IFR altitude (MEA).

(See MINIMUM EN ROUTE IFR ALTITUDE.)

MINIMUM DESCENT ALTITUDE (MDA)− 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 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, Con-

struction, 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

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