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Maid/Miles
Maid/Miles Magnetic anti-intrusion detector/magnetic
intrusion line sensor.
MAIM Méthodes Avancées en Ingénière Méchanique
(F 2003, focused on aerospace).
main airfield Permanent peacetime military airbase
offering at least potential for all facilities.
main bangs Transmitted pulses in radar (colloq.).
main beam Principal beam from a radar; usually all
others are unwanted.
main-beam clutter Caused by main beam intersecting
the ground.
main-beam killing ECCM technique in which, while
continuing to operate side lobes, main radar beam is
suddenly cut off.
main bearing Supports main rotating assembly in gas
turbine, crankshaft in piston engine.
main bridle Steel cable with eye at each end for mooring
aircraft on water.
main float Central float in three-float seaplane.
mainframe Central computer in large or geographically
dispersed EDP (1) system.
Main Gate Crucial point of supposed no return in large
programme, esp. in defence procurement; it may come
years after the start of prototype testing (UK).
main gear Main landing gear.
main landing gear Each or all units of landing gear
supporting nearly all weight of aircraft; other units are
nosewheel, or tailwheel, or lateral outriggers.
main line 1 Mooring line (airship).
2 Data highway, excluding side branches attached at
nodes.
3 Cable from electric generator to aircraft electrical
system.
main lobe That on axis of transmitting dish antenna.
main parachute Canopy supporting load, as distinct
from drogues, extraction chute, etc.
mainplane Wing, as distinct from tailplane or canard.
main rotor Helicopter rotor providing lift and propulsion.
main runway Airfield’s principal runway, normally in
use (usually longest).
main spar Principal spar of wing, having modulus
greater than others.
mainstage 1 In multistage rocket vehicle, that stage
having greatest thrust, excepting short-duration boosters
(see [3]).
2 In single-stage vehicle, main propulsion as distinct
from verniers, roll-control and other motors.
3 In smaller, or non-ballistic vehicles, sustainer propulsion
after separation of boost motors(s).
4 In large ballistic vehicle, period during which firststage
propulsion is delivering 90% or more of maximum
thrust.
main step Principal discontinuity in planing bottom of
hull or float to assist unstick, usually near c.g.
mainstream The principal flow through a gas turbine,
ignoring cooling and pressurizing flows and bleeds.
maint Maintenance.
maintenance Work required, scheduled and otherwise,
to keep aircraft serviceable, other than repair. Term
normally refers to minor tasks on flightline, but can also
include major operations normally called overhaul.
maintenance access terminal Major connection through
majority voting system
which engineers can interrogate systems and perform Bite
checks.
maintenance burden Usually total maintenance cost,
calculated as 1.8 times total maintenance labour cost.
maintenance data panel Electroluminescent or liquidcrystal
display which collates, logs and displays any faults
detected on avionics data bus.
maintenance dock Large structure fixed inside hangar
with hinged or separable sections which can be closed
tightly around large aircraft undergoing maintenance,
providing staircases to platforms at different levels
equipped with electric power and, usually, hydraulic and
pneumatic power and water supply. Some are configured
for particular type of aircraft.
maintenance lift Maintenance platform.
maintenance platform Mobile platform with scissors
elevation to maximum height up to c10 m (c33 ft); some
provide electric and other supplies.
maintenance recorder Wire or tape recorder for flight
time, engine operation and variable number of other parameters.
maintenance reserve Money set aside by a lessee to pay
the lessor a regular amount, usually per month, calculated
from hours flown [and other factors] in the previous
month. The intention is to cover deterioration and overhaul
costs during a long lease.
Maintenance Review Board Establishes maintenance
schedule for Transport Category aircraft.
maintenance schedule Prearranged plan for all maintenance
required through life of item [but subject to
revision].
maintenance status Non-operating condition deliberately
imposed.
Maintenance Steering Group Globally defined analysis
of minimum standard of scheduled maintenance required
by engines and systems [ATA] (Int.).
maintenance unit Military formation at fixed airbase
able to store, modify, overhaul, flight-test and scrap
aircraft.
main transverse Major frame of rigid airship joining all
longitudinals.
main undercarriage Main landing gear.
mainwheel Wheel of main landing gear.
Mair Maritime air (NATO).
MAISO Military Aeronautical Information Services
Office[r] (NATS AIS).
MAJCOM Major command (USAF).
Majiic Multi-sensor aerospace ground joint ISR interoperability
[or intelligence] coalition.
major Large [especially international-route] airline, to
which passengers are brought by regionals (US).
major aircraft review Search for items that can be
cancelled (UK).
major axis Principal axis through solid body, usually
along largest dimension or chief moment of inertia; where
possible, axis of symmetry.
majority rule Philosophy whereby two or more operative
channels (eg AFCS) always ‘out-vote’ single failed
channel.
majority voting system Redundant system wherein
outputs of three or more active channels are summed and
output is fed back to each channel. When failure of one
channel occurs, feedback causes all unfailed channels to
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