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Aeronautical Information Manual (AIM), page 673

12/10/15 Pilot/Controller Glossary

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- A
condition whereby the military services involved
assume responsibility for separation 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- 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- 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,
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

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

PCG M-3

Page 673 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

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