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HMGP
3 Heavy machine gun.
4 Hydraulically motored generator.
HMGP Heavy machine-gun pod.
HMH 1 Helmet-mounted HUD.
2 Heavy helicopter squadron (USMC).
HMI Human/machine interface.
HML Hard mobile launcher.
HMLA Helicopter squadron, light attack (USMC).
HMM Helicopter squadron, medium (USMC).
HMOB Hardened main operating base.
HMOS High-density MOS.
HMOSP Helicopter multimission optronic stabilized
payload.
HMP HMG (3) pod; –RL adds rocket launcher.
HMR 1 Homer.
2 Health-monitor[ing] recorder.
3 Helicopter main route.
hmr Homer.
HMRS Hotline mobile repair shop.
HMS 1 Health-monitoring system.
2 High-modulus sheet (CFRP).
3 Helmet-mounted sight; /D adds display, S system.
4 His/Her Majesty’s Ship, name bestowed on ships and
airfields of the Royal Navy. The latter were named after
seabirds; thus, RNAS Henstridge was HMS Dipper.
5 Heat-management system.
HMSO Her/His Majesty’s Stationery Office.
HMSS Helmet-mounted symbology system.
HMST Helmet-mounted sensory technologies [PO
adds program office].
HMT Helicopter Training Squadron (USMC).
HMTAS Helmet-mounted target-acquisition sight.
HMTDS Helmet-mounted target designation system.
HMTIS Helmet-mounted targeting and indication
system (R).
HMU 1 Hydromechanical unit.
2 Helmet-mounted unit.
3 Height-monitoring [or measuring] unit, for RVSM.
h μ , h mu Jet thickness or height.
HMV Heavy-maintenance visit.
HMX 1 Cyclotetramethylenetetranitramine; shocksensitive
explosive, most powerful in general use [see
HNIW].
2 Helicopter squadron, development (USMC).
HN, HN Sunset to sunrise (ICAO).
H n C.g. margin.
HN3 Nitrogen mustard gas (code USA).
HNIW Hexanitrohexazaisowurtzitane, most powerful
conventional explosive.
HNM Helicopter noise model.
HNMO Host-nation management office.
HNP Hypersonics National Plan.
h np US usuage for chordwise location of neutral point.
HNS 1 Host-nation support.
2 Hybrid navigation system.
HNSC House [of Representatives] National Security
Committee (US).
HNVS Helicopter night-vision system.
HO 1 Service available to meet operational requirements
(ICAO).
2 Hardover.
3 Helicopter, observation (USA, USN, 1948–62).
4 Handoff.
HoA 1 Heads of agreement.
holding fix
2 Head[s] of Agency.
hoar frost White semi-crystalline coating deposited in
clear air on surface colder than frost point (see frost).
HOB Height of burst.
Hobbs meter Logs engine operating time.
Hobo, HOBO Homing bomb [S adds system].
HOBS High off-boresight (missile aiming).
Hocac Hands on cyclic and collective.
Hocas Hands on collective and stick.
HOCSR Host and oceanic computer system replacement
(FAA).
HOD Head-out display, HUD type equipment
mounted on helmet and always in wearer’s LOS.
HODF Human-operaror describing function.
HOE 1 Homing overlay experiment, to kill RVs above
atmosphere.
2 Holographic optical element.
Hoerner tip Sailplane wingtip of curved downturned
shape; popular 1950–60.
Hofin Hostile fire indicator; detects shockwaves caused
by projectiles.
HOG Hermann Oberth Gesellschaft eV (G).
HOGE Hovering out of ground effect.
hogging 1 Machining from solid, esp. of large part out
of heavy forging.
2 Deformation of airship such that both ends droop.
3 Stressing condition of fuselage caused by sag of overhanging
nose or tail in flight or on ground.
4 Stressing condition of seaplane float or boat hull
when weight wholly supported by large wave at midlength.
Hohmann Describes minimum-energy transfer orbit
between two bodies, using their gravitational attraction.
Hohner Sailplane wingtip (see Hoerner tip).
HOJ Homing on jamming; fundamental ECM technique.
HOL 1 High[er]-order language [see HOLWG].
2 Holiday.
hold 1 To stop countdown until fault has been cleared.
2 Period of * (1).
3 To retain data in EDP (1) store after it has been
copied into another.
4 To fly standard pattern as requested until given
further clearance (see holding fix).
5 To wait on airfield at any time after arrival and before
departure under tower instructions.
6 Underfloor cargo compartment, identified as container
* or bulk *.
7 Above-floor compartment in all-cargo aircraft.
8 Manual adjustment for vertical/horizontal synchronization
of raster display.
holdback link Strong link between carrier aircraft and
deck, severed in accelerated takeoff; hence, any such link
in launch of missile or RPV.
hold-down test One carried out while vehicle, rocket
motor or other device is mounted on test stand.
holding Hold [4,5]; hence * course, * reciprocal, * side,
non-* side, * fix end, * outer (or outbound) end, etc.
holding area Region of holding fix.
holding bay Airfield area where aircraft in motion
(taxiing or towed) can be held (5) to facilitate ground
movement or accommodate queue for takeoff.
holding fix Navaid on which holding area is based, such
as VOR radial intersection, Vortac, ILS outer marker etc.
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