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Hipas
2 High-performance precision approach radar.
Hipas High-performance active sonar.
Hipcor High-power coherent radar.
HiPEP, Hipep High-power electric propulsion.
HIPO, Hipo Hierarchical input process output.
HIPPAG, Hippag High-pressure pure-air generator.
Hips Highly interactive problem solver.
HIPSS Helicopter integrated power and switching
system.
HIR 1 Harmful interference to radio [ICAO study].
2 Higher.
Hiran High-precision shoran.
HIRES 1 High resolution, pronounced hi-rez.
2 High-resolution Earth station.
HIRF High-intensity radiated field, or radio frequency.
HiRise High-resolution imaging science instrument
[Mars orbiter].
HIRL High-intensity runway light/lights/lighting.
HIRM High-incidence research model.
HIRNS, Hirns Helicopter IR navigation system.
HIRS 1 Helicopter IR system.
2 High IR sounder.
HIRSS Hover IR suppressor, or suppression, system.
Hirt High-Reynolds-number tunnel.
Hirta, HIRTA High-intensity radio transmission area.
Hirth coupling A method of precisely locating the
mating faces of two rotating assemblies, such as a turbine
disc and a hollow driveshaft, by high-precision radial
grooves which maintain perfect centering at all rotational
speeds.
HIS Hyperspectral imaging system.
Hisar Hughes integrated surveillance and reconnaissance.
Hisat, HISAT High-speed air-to-air target.
HISL High-intensity strobe light.
Hisos Helicopter integrated sonar system.
hi-spec Commonly means luxuriously appointed.
Hi-Spot High-altitude surveillance platform for overthe-horizon
targeting (airship, Lockheed).
Hiss ASW helo. (USN colloq.).
HiSTED, Histed High-speed turbine-engine development,
or demonstration.
historical Based on past values.
HISU Hybrid inertial sensor unit.
HIT, Hit 1 Homing-intercept technology.
2 Hybrid/inertial technology.
hit band Plot of initial velocity against initial path angle
for vehicle to make successful impact (hard/soft) on lunar
or planetary surface; usually very narrow and curved.
hit dispersion See dispersion.
HITL Human in the loop.
Hitmore Helicopter installed TV monitor recorder.
Hitron Helicopter Interdiction Tactical Squadron
(USCG).
HITS, Hits Hostile identification/targeting system.
HITT Holland Institute of Traffic Technology (Neth.).
hit the silk Abandon aircraft by parachute in emergency
(colloq.).
Hittile Direct-hitting guided missile, ie one designed to
explode inside target.
Hiwas Hazardous in-flight weather advisory service.
HJ, H J 1 Sunrise to sunset (ICAO).
2 Helicopter, utility (USN, 1944–49).
hj CC blowing jet slit height.
HMG
HJV Hot-jet velocity.
HKAOA Hong Kong Aircrew Officers’ Association.
Hkwr Hookwire (available).
HL 1 High-level airway, eg in North American VOR
system, other than Jet Routes.
2 Heavy lifter (airship class).
3 Height loss.
hl Hilite plane [suffix].
HLA 1 High-level architecture.
2 Helicopter Listing Association (US).
HLBA High-level bus analyser.
HLCS High-lift control system.
HLD Head-level display
HLDG Holding.
HLDC High-level data-link control.
HLE Higher-layer entity.
HLF 1 Hybrid laminar flow [N adds nacelle].
2 Heritage Lottery Fund (UK).
HLH Heavy-lift helicopter.
HLL High-level language.
HLLV Heavy-lift launch vehicle.
HLMD Hull loss per million departures.
HLO Helideck Landing Officer (oil rigs).
HLP Hybrid linear potentiometer.
HLS Helicopter landing site.
HLSI Hybrid LSI.
HLSTO Hailstones.
HLTC High-level target concepts (Acare).
HLTF High-level task force (MBFR treaty).
HLU Hybrid linear unit.
HLUAV Hand-launched UAV.
HLV 1 Heavy-lift vehicle (space launch).
2 In 2006 also said to mean Hybrid launch vehicle
(USAF).
HLWE Helicopter laser warning equipment.
HLYR Haze layer aloft.
HM Heavy maintenance.
H m Controls-fixed manoeuvre margin.
h m Per-cent-chord location of H m .
HMA 1 Helicopter maritime attack.
2 His/Her Majesty’s Aircraft (UK civil airliner individual
name prefix).
3 Hang-gliders Manufacturers Association [El
Segundo, CA] (US).
HMAFV Her Majesty’s Air Force Vessel (UK).
HMAS Her Majesty’s Australian Ship.
HMC Health-monitoring computer.
HMC&E Her Majesty’s Customs and Excise.
HMCS 1 Helmet-mounted cueing system.
2 Her Majesty’s Canadian Ship.
HMCU Hydraulic monitoring computer unit.
HMD 1 Helmet-mounted display [D adds device, S and
sight, SS and sight system].
2 Helicopter mine dispenser.
3 Hand-held metal detector.
HMDG Hydraulic-motor-driven generator.
HMDS 1 Hexamethyldisylazane.
2 See HMD 1.
HMEP Helmet-mounted equipment platform.
HMF Health maintenance facility, monitors health of
space-station human crew.
HMFU Hydromechanical fuel unit.
HMG 1 Her/His Majesty’s Government.
2 Hydromechanical governor.
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