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MEHTF
MEHTF Multiple-event hard-target fuze.
MEI 1 Multi-engine instrument rating.
2 Minimum-equipment item.
3 Maintenance engineering inspection.
4 Maintenance-error investigation.
5 Missile ECM improvement.
6 More-Electric Initiative.
MEIS Modular engine instrument system.
MEISR Minimum essential improvement in system
reliability.
Meissner effect Use of powerful superconducting electric
fields to levitate hardware, such as a rotating shaft,
without physical contact.
MEIT Multi-element integrated test.
MEK Methyl ethyl ketone solvent.
MEL 1 Multi-engine licence, or landplane.
2 Minimum equipment list, list of ME (3) items.
3 Missile ejector launcher.
MELC Main electrical load center (centre).
melée Confused close combat by numerous aircraft,
opposite of one-on-one.
MELHS Mobile electroluminescent helipad [lighting]
system.
Melin Multi-engine lead-in [training] (RAF).
Melios Minimum eyesafe laser IR observation.
MELS Multi-engine land and sea.
MEM 1 Module exchange magazine.
2 Multiple evaluation method.
3 Maintenance engineering management.
member Portion of structure bearing load.
memorandum of understanding Diplomatic agreement
signed at ministerial level between governments agreed on
collaborative programme, usually in advance of actual
engineering.
MEMS 1 Maintenance-error management system
(CAA, 2000–).
2 Module-exchange mechanism system.
Mems Microelectromechanical systems, now with such
prefixes as bio-, fluidic, optical, refractory and RF.
MENS Mission element need statement (DoD).
menu Range of variable inputs from human operator to
EDP, fire-control system, display or other electronic
system; files, codes, information, modes, formats, etc.
MEO 1 Mass in Earth orbit.
2 Medium Earth orbit.
3 Mission equipment operator.
MEOP Maximum expected operating pressure (solid
motors).
MEOTBF Mean engine operating time between failures.
MEP 1 Multi-engine pilot.
2 Mission equipment passage, or package.
3 Marine environmental protection.
4 Management engineering program(me).
5 Member of European Parliament.
6 Mean effective pressure.
7 Mars exploration program[me].
8 Manufacturing Extension Partnership.
Mephisto Multiple-effect penetrator high [or hard]
sophisticated target optimized.
MEPT Multi-engine pilot trainer.
Mepu, MEPU Monofuel emergency power unit.
MER 1 Multiple ejector rack.
2 Mission evaluation room.
Mesh
3 Minor equipment requirement [(A) adds Air] (UK).
4 True height above MSL.
5 Mars exploration rover.
6 Minimum experience requirement.
Mera 1 Molecular-electronics radar.
2 See MER (3).
Mercator 1 Map projection: light at Earth centre
projects map on to cylinder wrapped round Equator.
2 Map electronic remote colour autonomous television
output reader.
Mercier French aeroydynamicist with patents for closefitting
cowlings for radial engines and low-drag ailerons
hinged diagonally across wingtip.
mercury Hg, the only metal liquid at NTP, MPt –39°C,
BPt 357°C, density 13.5, used (rarely) as vapour in closedcircuit
space power and as ion beam (thrusters).
mercury battery Dry cell, 1.2V, KOH electrolyte
between mercuric oxide/graphite cathode and zinc anode.
Meredith effect Making a heat-rejection system, such as
a radiator or oil cooler, give positive thrust.
merge 1 The coming together of two fighters about to
engage in close combat.
2 To fly close beside unknown aircraft in order to identify
it visually.
meridian Great circle through any place on Earth and
the poles.
meridian altitude Altitude of celestial body when on
celestial meridian of observer (000° or 180° true).
meridian passage Time at which celestial body crosses
observer’s celestial meridian.
Meris Medium-resolution IR spectrometer.
Merkel number Heat transfer equation Me=bS´´´V/md
where b is mass-transfer coefficient, S´´´ transport surface
per unit volume, V volume and md mass flow of dry gas.
Merlin 1 Multi-service extended-range low-cost interceptor
(Darpa).
2 Modular ejection-rated low-profile imaging for night.
Mermoz effort Collaboration, led by Airbus/Boeing, on
improvement of global ATC (Int. 2003–).
Merod Message entry and readout device.
Merritt Island Site of largest KSC launch complexes
(Saturn V vehicle).
Merto Maximum-energy rejected takeoff.
MES 1 Major equipment supplier (large projects).
2 Main engine start(ing).
3 Medium-energy source (laser).
4 Multi-engine seaplane.
5 Mobile Earth station.
6 Multi-energy spectrum.
Mesa 1 Modular equipment stowage area (NASA).
2 Multirole electronically scanned array [radar].
3 Minimum emergency safe altitude.
mesa Raised portion[s] of microcircuit.
Mesar, MESAR Multifunction electronically-scanned
adaptive radar.
Mesas Multirole electronically scanned aircraft, or
airborne, system.
MESC Mid electrical (or, UK CAA, equipment) service
centre.
MESF Mechanical Engineering Support Flight (RAF).
Mesfet Metal semiconductor field-effect transistor.
MESG 1 Micro-electrostatically suspended gyro.
2 Main-engine starter/generator.
Mesh Measuring engineering safety and health.
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