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electrical and electronic work are:
Tera------------ 1012
Giga------------ 109
Mega----------- 106
Kilo ------------ 103
Milli ----------- 10-3
Micro ---------- 10-6
Nano ----------- 10-9
Pico ------------ 10-12
MFD (multifunction display). A liquid crystal or CRT display that shows a number of parameters and
replaces several analog-type indicators.
MHA (minimum holding altitude) (air traffic control). The lowest altitude prescribed for a holding
pattern which assures navigational signal coverage and communications and meets obstacle clearance
requirements.
mho. A unit of electrical conductance; it has been replaced by the siemen. One mho (one siemen) is the
amount of conductance that allows an electrical pressure of one volt to cause a continuous flow of one
ampere of current. The mho is the reciprocal, or opposite, of the ohm.
MHz (megahertz). 1,000,000 cycles per second.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 383
MIA (minimum IFR altitudes). Minimum altitudes for IFR operation 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 Parts 95 or 97, the following minimum IFR altitude applies:
1. In designated mountainous areas: 2,000 feet above the highest obstacle within a horizontal
distance of five statute miles from the course to be flown.
2. Other than mountainous areas: 1,000 feet above the highest obstacle within a horizontal distance
of five statute miles from the course to be flown.
3. As otherwise authorized by the Administrator or assigned by ATC.
mica. A transparent mineral of the silicate family that can be separated into thin sheets. Mica is a very good
thermal and electrical insulator. Thin sheets of mica are used as the dielectric in capacitors and as insulators
for electric irons and heaters.
Micarta. The registered trade name for a thermosetting phenolic-resin-impregnated cloth. Micarta is used
as an electrical insulator, as a chemical-resistant covering for tables and work surfaces, and for pulleys and
cable guides in aircraft control systems.
mice (gas turbine engine components). Small restrictors placed in the tail pipe of a gas turbine engine to
change the exhaust nozzle area. Changing the area of the exhaust nozzle affects the trim conditions of the
engine.
micro. The metric prefix that means one millionth, 1/1,000,000, or 0.000 001 of a unit. Microfarads,
microhenries, microwatts, and micrograms are all commonly used terms having this prefix. Micro is also
generally used as a prefix to mean something is unusually small; for example, microelectronics,
microbiology, and microgroove.
microammeter. An electrical current measuring instrument sensitive enough to measure a flow as small as
a few microamperes (millionths of an ampere).
microballoons. Hollow, microscopic-size spheres of hardened phenolic resin. Microballoons add body
with very little weight to a resin used as a filler. The resin is mixed with the proper amount of accelerator,
and then sufficient microballoons are added to give the resin enough body to be an effective filler.
microbarograph (meteorology). An aneroid barograph designed to record atmospheric pressure changes
of very small magnitudes.
microbial contaminants. A scum inside the fuel tanks of turbine-engine-powered aircraft caused by
micro-organisms that feed on the fuel and live in water that has condensed from the fuel. This scum clogs
fuel filters, lines, and fuel controls and holds water in contact with the aluminum alloy fuel tank structure
causing severe corrosion.
microburst (meteorology). A localized, extremely high-intensity column of descending air. Microbursts
have such extreme downward velocity that any aircraft, when flying slow near the ground, as during
takeoff and landing, can be slammed into the ground before it is able to fly out of it.
microcircuit (electronic component). A small electronic device having a large number of equivalent
circuit elements made onto a single substrate, or layer of supporting material. An IC chip is an excellent
example of a microcircuit, as it contains many equivalent components and many separate circuits, all in an
extremely small package.
microcomputer. An electronic computer consisting of a central processing unit (CPU), input and output
devices, and some memory capacity. Microcomputers are smaller and slower than either mini-computers or
mainframe computers.
microelectronics. The branch of electronics working with integrated circuits (ICs) and with extremely
　
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