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dedicated
dedicated Available only for one declared application;
thus a * dock is tailored to one type of aircraft.
dedicated runway That permanently assigned as main
instrument runway.
DEE 1 Di-ethyl ether.
2 Department of Education and Employment (UK).
DEEC Digital electronic engine control.
DEEP Dangerous-environment electrical protection
system.
deep Far down the runway [said of a landing].
deep cycling Pre-delivery test of electronics (rarely,
other hardware) by subjecting circuits to slightly excessive
voltages.
deepening Decreasing pressure in centre of existing low.
deep overhaul Major overhaul, not normally
performable by user.
deep space Not in vicinity of Earth.
deep stall Condition associated with T-tail, rear-engined
configuration characterised by rapid increase in angle of
attack to point where effectiveness of horizontal tail is
inadequate for longitudinal control, and stable longitudinal
trim point is reached with AOA up to 90°. Apparent
synonyms are locked-in stall, superstall.
deep surge Operating condition [transient and violently
unstable] in which air and possibly products of combustion
are expelled from the inlet.
DEEU Data-entry electronics unit.
DEF Defensive systems (USAF).
DEFA Direction des Etudes et Fabrications
d’Armement (F).
Defaids Defensive aids.
Defamm Development of demonstration facilities for
airport movements guidance control and management
(Euret).
Defcon, DEFCON Defence contracting (UK, MoD.).
DEFCS Digital electronic flight-control system.
Defdars Digital expandable flight-data acquisition and
recording system.
defence suppression Secondary objective of air attack on
enemy territory, to reduce or eliminate anti-aircraft
defences.
defense VFR Filed by aircraft cruising at 180 kt or above
intending to penetrate an ADIZ in VFR (US).
defensive combat spread Loose pair 1–2 miles
(1.6–3.2 km) apart and slightly separated fore/aft and
vertically.
defensive electronics Airborne ECM and EW equipment
used to protect aircraft against hostile defences.
defensive spiral Accelerating high-g continuous-roll dive
to negate attack.
defensive split Controlled separation of target element
into different planes to force enemy interceptors to
commit to one of them.
defensive turn Basic defensive manoeuvre to prevent an
attacker from achieving a launch or firing position.
deferment Agreed postponement of delivery.
deficiency Fault condition (known or suspected), equipment
shortage or other imperfection which may or may
not render aircraft unairworthy.
definition 1 Clarity and sharpness of image in display.
2 In contract proposal, complete description by
contractor of product offered.
definitize To complete the definition of (US usuage).
defl Deflection.
degree of freedom
deflation port Aperture in top of balloon gas envelope
through which contents are [Ed. opinion, foolishly] dissipated
after landing.
deflected slipstream Horizontal slipstream from propulsion
system deflected downwards by mechanical means to
augment lift for STOL or V/STOL performance.
deflecting yoke Mutually perpendicular coils around
neck of CRT which control position of electron beam,
enabling it to scan screen.
deflection 1 Bending or displacement of neutral axis of
structural member due to external load.
2 Change in radius of pneumatic tyre, expressed as
percentage.
deflection angle 1 In supersonic flight, that between
longitudinal axis and outer surface of bow [nose] of body.
2 That between longitudinal axis and surface [esp.
trailing edge of airfoil] determining angle of top and
bottom shocks.
deflection crash switch One triggered by impact significantly
changing shape of structure.
deflection error Lateral artillery error, as distinct from
range error, usually problem with land rather than air
targets.
deflectometer Instrument for measuring deflection
under load of airfield surface. There are several species.
Defra Dept. of the Environment, Food and Rural
Affairs, with many air-transport responsibilities [UK].
defruiting Elimination of fruiting by rejecting all nonsynchronous
replies; PRFs varying by 2.5μs can be
eliminated.
Defstan, DefStan Defence Standard (UK).
DEFT Directorate of Elementary Flying Training (UK,
until 2003).
DEFTS Defence Elementary Flying Training School
(replaced JEFTS 2003).
defueller Unit, usually vehicle-mounted, for draining
fuel and condensate from aircraft.
DEG Dressed engine gearbox.
DEG, Deg Degree[s].
degarbling Elimination of garbling by trying to extract
interleaved replies, differentiating between the exact
leading and trailing edges of the pulses.
degraded flight control Usually means failure of surface
power unit.
degraded performance Performance reduced by internal
shortcomings, eg airframe tiredness, engine gas-path
deposits, etc. Not normally used for external influences,
eg hot-and-high conditions.
degraded surface Airfield covered with snow, ice or
standing water.
degreasing Removal of grease, oil or related residue by
solvent, either liquid such as naphtha or vapour such as
trichlorethylene.
degree Non-SI unit of plane angle, = 1.745329
10 –2 rad.
degree of freedom 1 Mode of motion, angular or linear,
with respect to co-ordinate system; free body has six
possible ***, three linear and three angular.
2 Specif., of gyro, number of orthogonal axes about
which spin axis is free to rotate.
3 In unconstrained dynamic system, number of independent
variables required to specify state at given
moment. If system has constraints, each reduces *** by
one.
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