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dessyn
dessyn Synchro (trade name).
dest Destination airport.
destage To redesign an engine by removing one stage of
blading from an axial compressor (usually the last stage).
destretch To produce new version of transport aircraft
with fuselage of reduced length.
destruct To destroy vehicle after launch because of
guidance or other failure making it dangerous.
destructive test One which destroys specimen.
destruct line Map boundaries which vehicle must not
cross; any which does is immediately destructed.
destructor 1 Device, explosive or incendiary, for intentionally
destroying all or part of vehicle such as wayward
missile or aircraft down in enemy territory.
2 NW for undersea use.
DESU Digital electronic sequence unit (APU).
deswirl Deliberate reduction in swirl velocity, for whatever
reason. Hence *tubes, *vanes.
DET 1 Direct energy transfer.
2 Double-element thermocouple.
3 Or Det, detachment.
DETA Di-ethylene triamine.
detachable Capable of being removed from aircraft with
normal hand tools.
detachable pack Parachute held to the harness by quickrelease
clips.
detached shockwave One proceeding ahead of body
causing it.
detail 1 To design small part such as attachment
bracket.
2 Drawing (can be inset on main design drawing) giving
graphical representation of features.
3 Small military detachment for particular task.
4 To assign to special task or duty.
detail part One not normally broken down during
service or storage.
Detasheet Plastic explosive based on RDX/PETN.
detectable crack Nominal length 100 mm, 4 in.
detector Sensitive receiver for observing and measuring
IR.
detent A spring-loaded catch permitting linear movement
in one direction only.
deterrence Prevention of aggression through fear of
consequences.
DETF 1 Data-exchange test facility.
2 Delayed explosive tyre [tire] failure.
detolerancing The principal meaning is to open out
(relax) dimensional limits on airframe structure.
detonating cord Flexible explosive [usually shapedcharge]
pipe for emergency severing of doors, canopies,
etc. More recently spelt chord.
detonation 1 Violent and irregular combustion in piston
engine cylinder resulting from excessive compression ratio
or supercharging, or using inferior fuel; also known as
knocking or pinking.
2 Correct triggering of explosive.
detonator Explosive device usually sensitive to mechanical
or electrical action and employed to set off larger
charge of explosive.
detotalizing counter Indicates total remaining of
substance being measured, such as rounds for a gun or kg
of fuel.
DETR Department of the Environment, Transport and
the Regions [in 2002 became DfT] (UK).
dewpoint
Detresfa Distress phase of a search/rescue operation.
DEU 1 Display electronic unit.
2 Decoder/encoder unit (CIDS).
deuce Two fighter or attack aircraft, usually in loose
echelon formation.
deuteron Nucleus of deuterium.
deuterium Isotope of hydrogen (heavy hydrogen) whose
nucleus contains a neutron as well as a proton; used as
projectile in nuclear processes. Forms heavy water (D 2 O)
with oxygen.
deuteride Compound of deuterium. Lithium-6 deuteride
is a standard fusion material in NW.
DEV Deviation.
Devco Development Committee (ISO).
development 1 Process of converting first flight article
into mature product ready for delivery.
2 Ongoing process of improving production aircraft to
carry heavier load, fly farther, accomplish new tasks, etc.
3 Determining by mathematical calculation, computer
graphics or drafting methods, size, shape and other
pertinent characteristics of non-flat parts.
4 Opening of parachute canopy.
5 Generally not precisely quantifiable, process in which
aircraft becomes locked-in to stall, superstall or spin.
development contract Calls for development (1) of
particular hardware item.
development stage Begins as soon as hardware to new
design is available; main phase complete at service
(production) release or certification, but continues
throughout active life of aircraft.
deviation 1 Distance by which impact misses target.
2 Angular difference between magnetic and compass
headings caused by magnetic fields other than that of
Earth.
3 In statistics, difference between two numbers (also
known as departure), difference of variable from its mean
(esp. standard *), or difference of observed value from
theoretical.
4 In meteorology, angle between wind and pressure
gradient.
5 In radio, apparent variation of frequency above and
below unmodulated centre frequency.
6 In flying, sudden excursion from normal flightpath.
7 Any significant variation from plan.
deviation card Records compass courses corresponding
to desired magnetic headings.
devil Dust devil.
deviation light[s] Warn pilot or ground controller of
excessive departure from ILS beam.
DEW 1 Distant early warning.
2 Directed-energy weapon.
3 Dressed engine weight.
dew Atmospheric moisture condensed upon cold
objects, esp. at night.
dewar Thermally insulated container, eg for cryogenics.
DEWD Dedicated electronic-warfare display.
DEWIZ Distant early-warning identification zone,
extends from surface north of DEW line and around
Alaska.
DEW Line Distant early-warning radar stations at
about 70th parallel across North American continent
(1955–58).
dewpoint Temperature at which, under ordinary conditions,
condensation begins in cooling mass of air.
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