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holding off
holding off In landing an aeroplane, the final moments
of flight when the pilot keeps increasing pull on control
column to postpone landing/alighting in order to do so
either at lower speed or (tailwheel aircraft) in three-point
attitude.
holding pattern Racetrack pattern of precisely known
location, two parallel legs joined by turns at 3°/s or at 30°
bank.
holding point 1 See holding area.
2 Designated point for holding on airfield, especially
before entering active runway.
holding room Airport lounge.
holding side That side of holding course on which
pattern is flown.
hold short Land and stop before reaching any runway
intersection.
hole 1 Vacant space left by electron missing from crystal
lattice, hence any positive charge (fixed or mobile, in latter
case flow of * cloud through p-type semiconductor).
2 Air pocket (colloq.).
hollow charge See shaped charge.
hollow spinner Propeller spinner in form of annular ring
through which passes airflow for engine, cooling or other
purpose.
hollow-stem valve Piston engine exhaust valve stem in
form of tube filled with sodium or other material of high
specific heat for conducting heat from head.
holography Photographic record produced by interference
between two sets of coherent waves. Many unique
properties, one of which is 3-D nature of image.
Hols Holidays.
HOLWG High-order language working group [1975]
(DoD).
HOM 1 High-orbit mission.
2 Harmony order management (software).
home 1 To use matched-wavelength seeker and errorsensing
flight-control system in order to fly automatically
towards source of radiation.
2 To steer aircraft manually towards particular point
navaid or other emitter.
homebuilt Difficult to define, but generally accepted as
powered aircraft designed for construction by amateur.
Majority are designed professionally, with plans
approved by EAA or other authority and then duplicated
and sold to homebuilders. In some cases successful * is put
into commercial manufacture for sale, removing it from
category. Excluded; modifications of existing types,
replicas, restorations or copies of commercial designs.
Homeland Security Effective October 2002, US
Department exceeded in size only by Defense, with
c170,000 personnel integrated from Coast Guard, federal
Emergency, Customs, Immigration & Naturalization,
Border Patrol and Secret Service.
home-in See home (2).
home plate Base airfield to which aircraft are to recover
after mission.
homer VHF/DF station.
homing 1 Procedures for bringing two radio or other
EM stations, at least one airborne, together.
2 Guidance which causes a vehicle [e.g. aircraft or
missile] automatically to fly towards a particular source of
radiation.
homing beacon One on which pilot can home (2).
homing guidance System enabling unmanned vehicle to
Horizon
home (1), typically based on use of IR, IIR, EO/TV,
ARH, SARH, or SALH.
homing receiver Radio receiver indicating aurally/
visually when heading (rather than track) is not towards
transmitter.
homodyne Reception of DSB in which local oscillator
generates output synchronized with original carrier.
homogenous Having uniform radar reflectivity at all
points on surface (function of material substrate,
coating[s] and orientation).
homosphere Earth atmosphere below a height of about
100 km (62 miles), composition being almost constant.
homotron Soft failure.
HOMP Helicopter operations monitoring program.
HOMS Homing optical missile system.
Honcho Big chief, hence fighter ace or high-ranking
military or company officer (US, colloq.).
honeycomb 1 Low-density structural technique and
materials based on hexagon-cell honeycomb sandwiched
between two sheets too thin for stability alone; can be allmetal,
or any of the three components can be of various
other materials, joined by various adhesives. Can be
supplied as standard sheet, or parts can be made individually
with any form. Nid d’abeilles, NdA (F).
2 Grid of thin intersecting aerofoils or flat plates across
tunnel or other duct intended to remove turbulence from
fluid flow.
honking Being airsick, hence honk bag (cabin-staff
term).
HOO Helicopter offshore operations.
hood see canopy.
hoodoo Hose-drum unit (RAF, colloq.).
hook 1 Procedure used by air controller to direct EDP
(1) of semi-automatic command and control system to
take specified action on particular blip, signal or portion
of display.
2 Aerobatic manoeuvre resembling a lateral Cobra.
3 Arrester hook.
Hooke’s law Up to elastic limit, strain set up in elastic
body is proportional to applied stress.
hookman Member of carrier deck party charged with
unhooking aircraft after recovery.
hooks Interfaces available for future avionics, weapons
or other items not yet invented (colloquial).
Hoops, HOOPS Helicopter offshore operations.
Hoover highway Command flight-path display (colloq.).
HOP Hours of persistence.
hop 1 Very short flight; eg by aeroplane on fast taxi test
or by aerodyne only marginally capable of flight.
2 Full circuit in advance of official first flight.
3 Jump from one EM frequency to another by ECCM
subsystem.
Hope H 2 orbiting plane experiment [not same as next]
(Japanese NAL).
Hope - X High-orbiting plane experiment.
hopper 1 Small receptacle in oil tank for hot or diluted
oil to assist cold-weather start.
2 Container in ag-aircraft for dust (powdered
chemical).
Hops Helmet optical position sensor.
Horiz 1 Horizontal.
2 Horizon.
Horizon Hélicoptère d’Observation Radar et d’Investigation
sur Zone (F).
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