the Aviation Dictionary

major alteration manufactured rivet head
major alteration - An alteration not listed in the
aircraft, aircraft engine, or propeller specification, and
one which might
.
appreciably affect weight, balance,
--
structural strength, performance, powerplait operation,
flight characteristics, or other qualities affecting
airworthiness.
major axis of an ellipse - The longer axis passing
through one focus of an ellipse. See also ellipse.
major diameter - The diameter of a bolt or a screw to
the tip of the threads.
mandatory altitude - An altitude depicted on an
instrument Approach Procedure Chart requiring the
aircraft to maintain altitude at the depicted value.
mandatory altitude - An altitude depicted on an
instrument Approach Procedure Chart requiring the
aircraft to maintain altitude at the depicted value.
mandrel - 1. Lathe: A tapered shaft that fits into a hole
used to support and center a device or piece of material
so that it can be machined. 2. Tube bending: A long
steel rod with a rounded end inserted into a piece of
metal tubing in order to keep the tubing from flattening
while it is being bent.
major overhaul - The complete disassembly, cleaning,
inspection, repair, and reassembly of an aircraft,
engine, or other aircraft component in accordance with maneuverability - The ability of an aircraft to change
the manufacturer's specifications, and which will directions along a flight path and withstand the stresses
return the device to a serviceable condition.
imposed upon it.
major repair - A repair that, if improperly done, might maneuvering - In aviation, to move through a specific
appreciably affect weight, balance, structural strength, series of changes in direction, speed and position for a
performance, powerplant operation, flight specific purpose. Often used in regards to positioning
characteristics, or other qualities affecting an aircraft in the landing - pattern.
A
airworthiness. FAR 43, Appendix A provides guidance
manganese - A non-magnetic chemical element of
on what constitutes major repairs and alterations.
grayish white with a symbol of Mn and an atomic
major structural damage - Damage to a structure that number of 25. Used in the manufacturing of iron,
requires a major repair in order to return it to proper aluminum, and copper alloys.
working or operating condition.
manganese dioxide - A chemical compound used in
make short approach - Used by ATC to inform a pilot carbon-zinc batteries to absorb the hydrogen gas that
to alter his traffic pattern so as to make a short final would otherwise insulate the carbon rod when electrons
approach.
flow from the zinc can to the carbon.
make-and-break ignition - One of the earliest forms of Manganin - An alloy of copper, manganese, and nickel.
electrical ignitions for internal combustion engines. It
manifest - A list of passengers and cargo carried on any
produced an arc when two contacts carrying lowone
flight.
voltage current within the cylinder were separated.
manifold - A chamber having several outlets through
male electrical connector -- The pin contact that
which a liquid or gas is distributed or gathered.
completes a circuit by sliding inside a socket (the
female connector).
manifold absolute pressure (MAP) - The absolute
pressure, measured in inches of mercury, existing in
male fitting - A fitting designed to be placed, screwed,
the intake manifold of an engine. This is the pressure
or bolted into another unit.
that forces the fuel-air mixture into the cylinders.
malfunction - The failure of a part of a component to
manifold pressure - The absolute pressure, measured in
function; a deviation in the operation of a unit from its
inches of mercury, existing in the intake manifold of an
intended purpose or design.
engine. This is the pressure that forces the fuel-air
malleability - The measure of a material's ability to be m&re into the cylinder.
stretched or shaped by beating it with a hammer or
manometer - An instrument consisting of a glass tube
passing through rollers without breaking.
filled with a liquid for measuring the pressure of gases
malleable - The ability to be stretched or shaped by or vapors either above or below atmospheric pressure.
beating with a hammer or passing through rollers
manual depressurization valve - A back-up valve used
without breaking.
to control cabin pressurization by manually controlling
mallet - A hammer with a heavy wood, plastic, rubber, the outflow of -air from the cabin if the automatic
or leather head.
system malfunctions.
mammatus - Bulges or pouches that appear under the
anvil of a mature cumulonimbus cloud.
manufactured rivet head - The preformed head of an
aircraft rivet when it is manufactured at the factory.
Also referred to as a shop head.
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