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Imint
3 Initial maintenance interval, or inspection.
4 Interactive multimedia instruction.
5 Imbedded [=embedded] message identifier.
Imint Imagery intelligence.
IMIS Integrated maintenance information system.
IMK Increased maneuverability kit (US).
IML 1 International micro-gravity laboratory
(Spacelab).
2 Inner mould line.
IMLS Interim MLS.
IMM 1 Intelligent menu-management.
2 Interacting multiple model.
3 Ignition-mitigation means [fuel-tank explosion].
4 Integrated marketing management.
IMMC Integrated mission-management computer.
Immed Immediate.
immediate air support That meeting specific request
during battle and which cannot be planned in advance.
immediate award Decoration awarded without the usual
assessment process.
Immelmann Air-combat manoeuvre. Two definitions
current: (a) first half of loop followed by half-roll,
resulting in 180° change of heading and gain in height;
(b) steep climbing turn to bring guns to bear on target
again following dive attack from front or rear.
immersed pump Booster pump.
IMN 1 Indicated Mach number.
2 Induced matrix norm.
IMO 1 International Maritime Organization.
2 International Meteorological Organization (1872–).
I mo Motor specific impulse (solid propellant).
IMOK I am OK.
IMP 1 Interactive microprogrammable.
2 Indication of microwave propagation (anaprop) to
exploit gaps in hostile radars and assess friendly radars in
defence.
3 Incremental modernization program [simulators].
4 Inter-modulation product.
5 Interplanetary monitoring platform.
6 Integrated missile panel.
Impact Integrated multistatic passive/active concept
testbed (sonobuoys).
impact area Area having designated boundaries within
which all ordnance is to hit ground.
impact microphone Sensitive to small vibrations, as of
micrometeoroid impact.
impact point 1 Point on drop zone where first parachutist
or air-dropped cargo should land (NATO, IADB).
2 Point at which projectile, bomb or re-entry vehicle
impacts or is expected to impact (DoD).
3 Reference point of accident from which all surveys are
plotted, easily identifiable and either central or having
highest density of contamination (USAF); this need not
be actual point of impact.
impact pressure See stagnation pressure.
impact tests Charpy, Izod and similar tests to measure
resistance of material to suddenly imposed stress.
Impatt Impact-ionisation avalanche transit time (solidstate
oscillator).
IMPD Interactive multipurpose display.
IMPDS Improved missile point-defence system.
impedance Resistance to a.c. (1), symbol Z = √(R 2 +X 2 )
where R is ohmic resistance and X is reactance.
impeller Single-stage radial-flow compressor rotor.
IMSS
Imperial System of units previously standardized in
UK, such as foot (ft) and pound (lb).
Imperial gallon See gallon.
impervious canopy One through which ejection is
prohibited.
impingement Impact of high-velocity air or gas on structure
(eg in reverse-thrust mode).
impingement cooling Cooling of material by highvelocity
air jets directed on to surface (usually internal
surface of hollow blade or vane).
impingement injector Liquid fuel and oxidant jets impact
on each other to cause swift breakup and mixing.
implosion Detonation of spherical array of inwardfacing
shaped charges (eg to crush fissile core of nuclear
weapon).
IMPR Improving.
impress To commandeer a civil aircraft into government
service in time of emergency.
improved climb T-O Take-off at increased weight
allowed by raising V 2 where second segment is limiting
factor and runway distance is available.
improved conventional munition Usually means fitted
with electronic time fuze or RF proximity fuze.
IMPS International Microelectronics and Packaging
Soceity (Int.).
IMPT Important.
impulse Rocket burn-time multiplied by burn-time
average thrust; total energy imparted to vehicle.
impulse magneto One whose drive incorporates stops
and spring-loaded coupling (bypassed by centrifugal
clutch in normal running) to give series of sudden rotations
and thus hot sparks during starting.
impulse/reaction Common form of gas turbine,
combining impulse and reaction techniques.
impulse starter Incorporated in impulse magneto.
impulse turbine One whose working fluid enters at
lowest pressure and maximum velocity, expands through
diverging passages, and leaves at similar pressure and low
velocity.
IMR 1 Imaging microwave radiometer.
2 Initial manufacturing release.
IMRO Industrial Marketing Research Organization
(UK).
Imron Range of du Pont polyurethane enamels.
IMRS Integrated maintenance recording system.
IMS 1 Information management system.
2 Integrated management system.
3 Intermediate maintenance squadron.
4 International Military Services (MoD, UK) or Staff
(NATO).
5 Integrated multiplex[ing] system, ties nav, weapons,
air data and FBW.
6 Inertial measurement system.
7 Integrated mission system.
8 Inventory management system.
9 Ion mobility spectroscopy, or spectrometer (explosives/narcotics
detection).
10 Intelligent munition system.
I’m safe One of 35 English-language safety-related
mnemonics: illness, medication, stress, alcohol [+ drugs],
fatigue, emotional problems.
IM-6 Structural graphite/epoxy composite material
(Hercules).
IMSS Integrated multisensor system.
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