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Disco
Disco Directional composite whose resin-impregnated
fibres can slip past each other, giving highly deformable
product which retains directional strength properties.
Discon Defence integrated secure communications
network (Australia).
disconnect Inadvertent or deliberate severance of flow
during boom-type air refuelling.
disconnect bolt Manually removed link in nose landing
gear to permit sharper turns when under tow on ground.
discontinuity 1 Sudden break in the continuity of mathematical
variable.
2 In meteorology, zone within which there is rapid
change, as between two air masses.
discontinuous fibre Chopped roving as distinct from
yarn or tow.
discount carrier Despite next entry, one that [often in
partnership with another] legally offers permanent lowcost
travel, principally for tourists.
discounting Illegal selling of airline tickets, for affinity
group and other promotional fares, at below agreed
tariffs.
discourager A form of gas sealing insert closely related
to honeycombs and labyrinths.
Discr Discrepancy.
discrete code Any of the 4096 xpdr codes available to
ATCRBS except those ending with a zero.
discretion Flight time outside normal crew duty limits
but legally permitted with concurrence of captain or PIC.
discrimination 1 Of radar, minimum angular separation
at which two targets can be seen separately.
2 Precision with which satellite antenna can focus in
particular direction.
discriminator Stage of FM receiver which converts
frequency deviations of input voltage into amplitude variations.
discus Of variable-geometry wing, part-circular portion
of upper surface of fixed glove on which swinging portion
can slide.
disembark To step down from COD aircraft.
dish Reflector for centimetric radar waves whose
surface forms part of paraboloid or sphere.
dishing 1 Pressing regular depressions in thin sheet to
increase stability and resistance to bends.
2 In formation aerobatics, unwanted distortion of
planar formation into dish shape [e.g. in formation roll].
disk Disc, except for compact *.
dismounted flight training Hands-off training on ground
using hand-held model aircraft, particularly for aircombat
tactics.
DISN Defense Information System Network (DoD).
Disney bomb Armour-piercing free-fall bomb weighing
4,500 lb (2041 kg) finally accelerated to 2,400 ft/s
(1089 ms –1 ) by rocket (UK WW2).
DISOSS, Disoss Distributed office support systems
(SNA).
DISP Displaced.
dispatchable Cleared to fly despite deficiencies [e.g.
engines in N 1 instead of EPR mode].
dispatch 1 To supervise exit of parachutists, or to
unload stores with parachutes attached, from aircraft in
flight.
2 Process of supervising readiness of civil transport for
next flight, with departure on schedule.
dispatch deficiency Malfunction, failure, breakage,
dispersion
missing equipment item or other irregularity which does
not prohibit on-time departure.
dispatch delay Any notifiable delay, measured variously
from either 5 or 15 min, in departure of scheduled flight.
dispatch deviation Any reportable irregularity other than
deficiency which does not prohibit on-time departure.
dispatcher One who is responsible for despatching an
airline flight See air*.
dispatch reliability 1 Essentially self-explanatory, the
quantified record of an aircraft in repeatedly fulfilling its
design mission. It can be plotted graphically with probability
of dispatch as the ordinate [the axis typically
extending from 0.95 to 1] and the number of days without
maintenance action as the abscissa. Thus, for each failure
the aircraft shall be able to operate for a specified number
of days with the stipulated likelihood of a second failure
not occurring.
2 Percentage of all scheduled flights by particular
aircraft or all aircraft of that type, often over specified
period or for particular operator, that departed on time
(measured as within 5 or 15 min).
dispensation Agreement to waive a rule without
affecting safety.
dispenser 1 Container from which objects [e.g., ECM
chaff cartridges, flares and active emitters] can be ejected
in predetermined sequence.
2 Externally carried container for bomblets or other
small multiple munitions.
dispensing 1 Release of ECM payloads in controlled
manner.
2 Supply of fuel to aircraft via hydrant.
dispensing sequence Graphical or tabular plan for ECM
to meet expected threats.
dispersal 1 Geographical spreading out of aircraft,
material, establishments or other activities to reduce
vulnerability to enemy action.
2 Dispersal area.
3 Parking area, usually paved, accessible from
perimeter track, on which one aircraft could be parked.
Some WW2 airfields had over 100.
dispersal airfield Potential operating platform for
strategic aircraft, especially bomber with NW, which
could within hours become an operating base following
political crisis or actual attack [1957–90].
dispersal area Area usually on remote parts of airfield to
which aircraft and support equipment can be dispersed in
wartime.
dispersant oil Lubricating oil with additives which slow
or even prevent formation of sludge and other solid
deposits.
dispersion 1 Average distance from aim point of bombs
dropped under identical conditions or by projectiles fired
from same weapon or group of weapons with same firing
data.
2 In AAA, scattering of shots about target.
3 In chemical operations, dissemination of agents in
liquid or aerosol form from bombs and spray tanks.
4 In rocketry and AAM testing, deviation from
prescribed flight path; circular dispersion.
5 Measure of scatter of data points around mean value
or around regression curve, usually expressed as
standard-deviation estimate or standard error.
6 Process in which EM radiation is separated into its
components.
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