1Dk4eXg

Halsol
stored as liquid under pressure and used as fire extinguishants
and for inerting space above fuel in tanks.
Halsol High-altitude solar [-powered aircraft].
HALT, Halt Highly, or hardware, accelerated life
test[s].
halteres Twin vibrating prongs used in certain timekeeping
systems.
hammer Sudden violent excursions in pressure caused
by reflected shockwaves in closed fluid (esp. hydraulic)
system.
hammerhead 1 Large circular paved area at end of
runway to facilitate turning.
2 See next.
hammer stall Extreme stall turn in which aircraft rotates
within c 5° of vertical plane; depending on aircraft, power
retained until point of stall at apex. Also called hammerhead
stall.
Hamots High-altitude multiple-object tracking system.
HAMS Hot-air management system.
han Hydroxyl ammonium nitrate.
handbook problem One requiring in-flight consultation
of flight manual for numerical answer.
hand bumping Use of hand tools and backing dollies to
shape sheet metal.
hand controller Human interface to automatic or semiautomatic
system, eg to HUD, multi-mode radar or large
display; usually incorporates stick, rolling ball or triggers.
hand-crafted Still used to mean IC (4) is customdesigned
for particular application, even though design is
entirely via computer graphics.
hand cranking Direct mechanical connection between
crank and piston engine or small gas turbine (in latter case
via step-up gears) for starting.
handed Items on left of aircraft are mirror-image of
those on right; see next.
handed propellers Left and right ** rotate in opposite
directions.
hand flying Piloting autopilot-equipped aircraft in fully
manual mode.
hand forging Forging by hand tools.
hand forming Shaping ductile sheet with hand tools and
accurate form blocks tailored to flanging, beading etc.
hand geometry Basis of one branch of biometrics
concerned with linear and rotary measures, but not forces.
hand-held microphone Self-powered (battery) microphone
for use in light aircraft following total electrical
failure, usually connected to external antenna at
121.5 MHz.
hand inertia starter Hand crank spins flywheel which,
when at full speed, is suddenly clutched to start piston
engine.
handlebar moustache Wide with upturned ends (RAF
fashion, WW2).
handler Apron loader of cargo.
Handley Page slat, slot See slat.
handline Firefighting hosepipe stowed on CFR vehicle,
unreeled and deployed manually.
handling 1 Subjective impressions of response to
controls of particular aircraft; hence * squadron.
2 Manoeuvring of aerostat by ground crew or landing
party.
3 Providing full service for operator at airport where
that operator has no staff. Customer is usually an aircarrier.
hang up
4 Response of [usually gas-turbine] engine to varying
power demand; see next.
handling bleed Air bleed, usually from compressor, to
avoid surge caused by varying power demand.
handling line 1 Primary line used by ground crew for
handling aerostat.
2 Single or twin cables attached above c.g. of seaplane
for use when hoisting by crane into or out of water.
handling pilot Pilot actually flying the aircraft.
handling squadron Assigned assessment of new aircraft,
and compilation of Pilot’s Notes.
handoff Transfer of control or surveillance from one
ground radar controller to another.
handover Handoff (military).
hand priming Manually squirting a spray of fuel into the
engine inlet manifold [if fitted, by a cockpit inceptor].
hands-off 1 Condition in which non-autopilot aircraft,
usually aeroplane, flies by itself in perfect trim with
pilot(s) not touching controls.
2 Flight on autopilot.
3 Ground party release balloon basket, permitting
ascent.
hands-on 1 With human(s) interfacing with system,
which can be EDP (1) or aircraft in flight; appropriate
only to complex autopilot aircraft in which * is rare in
cruising flight. Hence, * training = practice in hand flying,
or interfacing manually with military sensors and weapon
systems.
2 Ground party hold down balloon basket.
hand starter Arrangement for starting engine by hand
other than by swinging propeller.
hand-starter magneto Separate hand-controlled auxiliary
magneto carried to aircraft and used to supply
powerful spark when starting piston engine.
hand-turning gear Connection for a hand-crank, eg on
same shaft as centrifugal breather to give maximum
mechanical advantage. In piston engine can be same as
manual or hand starter.
hangar Shelter for housing aircraft on ground.
hangarette 1 Hangar tailored to single aircraft, esp. hard
shelter [HAS 1 now almost universal].
2 Weatherproof cover over missile launcher or similar
installation.
3 Pre-fabricated hangar flown to FOL and rapidly
erected.
hangar flying Social chat about flying by those involved
in it, esp. pilots.
hangar queen Particular aircraft notoriously prone to
unserviceability requiring major maintenance.
hangar rat Young enthusiast [self-explanatory].
hangfire Fault condition in which rocket missile fails to
fire; vehicle or missile thus affected.
hang glider Large class of simple ultra-light aerodynes,
broadly divided into those with flexible wings (most of
Rogallo type) and those having wings with preformed
aerofoil section (called rigids); majority have no controls
and manoeuvre by translation of pilot mass to shift c.g.
Can be monoplane or biplane, and may have rear tail,
canard or auxiliary engine. Demarcation line with glider
or ultra-light aeroplane becoming blurred.
hang up 1 Externally or internally carried store which
fails to release when thus commanded.
2 Gas-turbine engine which starts but fails to spool-up;
also called hung start.
310