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MEARW
MEARW Multi-engined advanced rotary-wing (school,
RAF Shawbury).
MEAS Mechanical engineering aircraft squadron
(RAF).
measured performance That measured on one occasion
under specified conditions; usually slightly higher than
gross performance.
measured thrust That measured on one occasion under
specified conditions, usually by force transducers on
testbed (see installed/net/gross thrust).
measured thrust coefficient For solid-propellant rocket,
thrust-versus-time integral over action-time interval
divided by product of average throat area and integral of
chamber pressure versus time over action-time interval;
symbol C f .
meatball 1 Colloquial American for any guidance reference;
thus, on the *, to hack the *.
2 Accurately flown final approach.
3 Carrier optical landing aid as seen by correctly
aligned pilot.
4 Fresnel lens.
MEB 1 Main elecronics box.
2 Marine Expeditionary Brigade.
3 Modular expendable block (countermeasures).
Mebul, MEBUL Multiple engine build-up list.
MEC 1 Main, or mechanical, engine control.
2 Main equipment centre.
3 Modular electronics concept.
4 Master Executive Council (ALPA).
5 Modular exploitation capability [to achieve interoperability
for all ISTAR] (MoD, UK).
MECA Missile electronics and computer assembly.
Mecaplex Registered acrylic plastic sheet similar to
Plexiglas.
mechanical See * horsepower.
mechanical de-icing Using distortion (eg rubber boot),
centrifugal force or other physical method to dislodge ice.
mechanical efficiency Work delivered by a machine as
percentage of work put in, difference being mainly
frictional losses.
mechanical equivalent of heat See joule.
mechanical horsepower Shaft horsepower.
Meco Main-engine cutoff (large rocket vehicle).
MECU Main-engine control unit.
MECV Mobile explosive containment vessel.
MED 1 Multifunction electronic display [S adds system,
or subsystem].
2 Maximum-entropy discrimination.
3 Medium.
4 Medical.
5 Mediterranean regional area.
Med Medium.
MEDA 1 Military emergency diversion airfield.
2 Maintenance error decision aid.
Medcat Medium-altitude CAT.
Medevac Military airlift of sick or wounded.
median lethal dose That over whole body which would
be fatal to 50% of subjects.
median line Line through aerofoil profile at all places
equidistant from nearest points on upper and lower
surfaces, = mean line.
median selection Automatic choice of mean and rejection
of extreme values; can also mean majority voting.
MEHT
Mediator Unsuccessful grand design for UK ATC (1)
system embracing all air traffic.
medium aircraft Meaningless, but in 1998 the 737 was
cited as an example. An ICAO document once said,
7,000–136,000 kg MTOW.
medium altitude Between 2,000 ft and 35,000 ft (DoD).
medium-altitude level bombing Release between 8,000 ft
and 15,000 ft (DoD).
medium-angle loft bombing Release at 35° to 75° from
horizontal.
medium bird For impact or ingestion certification, one
weighing 1.5 lb, 0.68 kg.
medium bomber Former category defined quite differently
by different air forces, either by bomb load or range,
and so developed 1920–50 as to make numerical values
meaningless.
medium cloud, CM Cloud types prefixed by alto-;
according to BSI with average height 8,000 ft to 20,000 ft
(2,438–6,096 m).
medium Earth orbit Between LEO and synchronous.
medium frequency EM radiation with superimposed
carrier at 300 kHz–3 MHz.
medium-range ballistic missile Operational range 600 to
1,500 nm (1,112–2,780 km); see mid-range ** (DoD).
medium-range transport Full-payload range 1,500 to
3,500 nm (2,780–6,486 km).
medium-scale integration Normally taken to mean
50–500 circuits or gates per chip.
medium-scale map From 1:75,000 to 1:600,000 (DoD,
IADB).
medium turn Most authorities define as bank angle 25°
to 45°.
medium-wave Rare in modern radio/radar; in IR means
wavelength 3–5 .
MEDS, Meds Multifunctional electronic display
subsystem, new (2002) guidance for Shuttle Orbiters and
STA (6).
Medusa Multifunction electro-optics for defense of US
aircraft (AFRL).
MEE More electric engine.
MEECN Minimum essential emergency communications
network.
MEF 1 Minimum essential facilities.
2 Marine Expeditionary Force.
3 Maximum elevation figure[s].
MEFC Manual emergency fuel control.
MEG Motionless electromagnetic generator.
mega 1 Prefix, ×10 6 ; symbol M, thus MW =
megawatt[s]; a omitted in megohm[s].
2 In EDP = 2 20 = 1,048,576.
megacycles Megahertz.
Megafloat Technology for floating offshore airports.
megahertz 10 6 cycles per second, MHz.
megajet Jet aeroplane of over 10 6 lb MTOW.
megaline 10 6 maxwells, = 10 –2 Wb.
megaton, MT Explosive power equivalent to nominal
1,000,000 short tons of TNT.
M/EGB Metal and end-grain balsa.
MEGG Merging.
megger Universal electrical continuity and resistance
tester (colloq., arch.).
megohm Ohm × 10 6 , symbol MΩ.
MEHT 1 Minimum, or mean, eye-height over threshold.
2 Multiple-event hard target.
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