the Aviation Dictionary

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middle marker. minidisk
middle marker - A marker beacon that defines a point
along the glide slope of an ILS normally located at or
near the point of decision height (ILS Category I). It is
keyed to transmit alternate dots and dashes, with the
alternate dots and dashes keyed at the rate of 95
dotldash combinations per minute on a 1300 Hz tone,
which is received aurally and visually by compatible
airborne equipment.
. .
mid-flap - The middle flap on a triple-slotted segmented
flap.
mid-span shrouds - The lugs on fan blades that contact
each other to provide a circular support ring. Mid-span
shrouds provide strength and reduce vibration.
mid-span weight - A weight placed in the mid-span
area of a helicopter rotor blade to add inertia to the
blade.
mid-wing airplane - An airplane having its main
aerodynamic surface located in the center of the
fuselage.
migrate - To move from one place to another. During
an inspection, a technician might discover a fastener
has moved or migrated - from its intended location to
another location due to vibration or jostling.
migration - See migrate.
mil - Commonly used to represent one one-thousandth
(0.001) of an inch.
agreement or other appropriate FAA or military
documents.
military operations area (MOA) - Airspace
established outside of a Class A airspace area to
separate or segregate certain nonhazardous military
activities from IFR traffic and to identify for VFR
traffic where these activities are conducted.
Military Standards (MS) - The standards used for
aircraft hardware in order to maintain a high degree of
quality standards in the manufacturing, repair, and
maintenance of aircraft. Originated by the U.S. military
services.
military training route (MTR)- Airspace of defined
vertical and lateral dimensions established for the
conduct of military flight training at airspeeds in excess
of 250 knots IAS.
mill bit - A tool used with a router to remove metal and
honeycomb core for repairs to bonded structure.
mill file -A single-cut file, tapered slightly in thickness
and in width for about one-third of its length.
milli - One one-thousandth (0.00 1) of a unit.
milliameter - An electrical current measuring device
calibrated to read in milliamperes. 1000 milliamperes =
1 ampere.
milliampere - One-thousandth (0.001) of an ampere.
millibar - A unit of barometric pressure equal to
mild steel - Steel that contains between 0.05 and 0.25%
approximately 0.75 millimeters of mercury. Standard
carbon.
sea level atmospheric pressure is equal to 1,013.2
mildew - A gray colored parasitic fungus growth that
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millibars.
forms on organic matter. -
milling machine - A metal-working machine tool with a
mildewcide - An additive to dope or sealers used when movable table that feeds the work into a rotating
covering organic materials to inhibit the growth of milling cutter.
mildew.
millivolt - One-thousandth (0.001) of a volt.
mile (mi)- One statute mile. Equal to 5,280 ft.
MILSPEC - A term used to identify military
mileage break point - On IFR charts, points other than specifications.
intersections br navaids where the mileage is broken
mineral-based hydraulic fluid - A petroleum-based
down for reasons such as reception distance. The
hydraulic fluid consisting essentially of kerosene and
distances between navaids is in a box. A number
additives to inhibit corrosion and minimize foaming. It
without an outlined box indicates mileage between any
is dyed red and is identified as MIL-H-5606.
combination of intersections, navaids, or mileage - break
points. All distances are in Nautical Miles.
miniature screw - A screw less than 0.06" in diameter,
having a slotted head and threaded for assembly with a
miles-in-trail - A specified distance between aircraft,
preformed internal thread.
normally, in the same stratum associated with the same
destination or route of flight.
minicomputer - A small digital computer.
military authority assumes responsibility for minidisk - A mass storage medium used in digital
separation of aircraft (MARSA) - A condition computers. Most common is the 3-112-inch diskette,
whereby the military services involved assume also known as a floppy. Older computers used 8-inch
responsibility for separation between participating and 5-114-inch minidisks. Most modem personal
military aircraft in the ATC system. It is used only for computers use CD ROM disks as well as 3-112-inch
required IFR operations that are specified in letters of diskettes.
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