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demounting
any decision on procurement and often to establish what
is possible.
demounting One meaning is to remove tyre from wheel;
the wheel may include a demountable flange.
Demoval, Demval Demonstration and validation.
Dempi [pronounced dimpy]. Designated mean point of
impact.
Denalt Density altitude.
DENEB, Deneb Fog-dispersal operation.
DEngRD Directorate of Engine Research and Development
(UK).
denitrogenation Removal of nitrogen dissolved in blood
and body tissues, usually by breathing pure oxygen for
extended period, to minimise aeroembolism. Also called
preoxygenation.
densified wood Multiple laminates bonded under high
pressure.
densitometer 1 Instrument for measurement of optical
density, generally of photographic image.
2 Instrument for measuring fuel density, usually part of
fuel measurement system.
density 1 Mass per unit volume; SI unit
kg/m 3 = 0.062428 lb/ft 3 = 0.01002 lb/Imp gal; 1g/cm 3 =
0.036127 lb/in 3 ; 1lb/in 3 = 27.6799 g/cm 3 =27,679.9 kg m -3 ;
1 lb/ft 3 = 16.0185 kg/m 3 [reciprocal, 0.0624278]. Often
needs qualifying for temperature and pressure (see
absolute*, relative*).
2 Of aircraft, MTOW divided by total aircraft volume
calculated from external envelope, or divided by both
wing area and mean chord.
density altitude Pressure altitude corrected for non-ISA
temperature.
density error Correction to EAS to give TAS (see
airspeed).
deorbit Deliberately to depart from spacecraft orbit,
usually to enter descent phase or change course.
DEOS Digital engine operating system.
DEP 1 Department of Employment and Productivity
(UK).
2 ICAO code for depart, departure, departure message.
3 Departure airfield.
4 Design eye position (usually of pilot).
5 Direct-entry pilot.
6 Data-entry panel.
departure 1 Any aircraft taking off from airport (as
distinct from other airfields) under departure control.
2 In air navigation, distance made good in E/W
direction, usually expressed in nm.
3 General term for uncontrolled flight beyond the stall;
see divergence (1) or disturbance (2).
departure alternate Alternate airfield specified in flight
plan filed before takeoff.
departure control Function of approach control
providing service for departing IFR aircraft and, on
occasion, VFR aircraft in such matters as runway clearances,
vectors away from congested areas and radar
separations, all at nominated time.
departure pattern That flown in 3-D by departure (1).
departure point Navigational check point, such as VOR
or visual fix, used as a marker for setting course.
departure procedures ATC procedures (usually SID)
flown by departing aircraft during climb-out to minimum
en route altitude.
departure profile Flight profile flown by departure (1) to
depth
suit needs of vertical and horizontal separation, noise
abatement, obstacle clearance, etc.
departure runway That from which departures (1) are
cleared.
departure stall On attempted takeoff from small field,
pilot avoids obstacle ahead by steep bank and sharp turn,
then applying top rudder, stalling upper wing.
departure strip Flight progress strip recording callsign,
ETD and route of departure.
departure tax Imposed by most states at flat rate per
passenger.
departure track That followed by departure (1).
departure traffic Total number of departures, scheduled
and non-scheduled, from one airport, usually expressed in
movements per hour or per day.
DEP CON Departure control.
Depcos Departure co-ordination system (Airsys); see
Depos.
depigram Plot of variation of dewpoint with pressure for
given sounding on tephigram.
deplane Normally transitive verb, to ask all occupants to
leave aircraft, especially because of fault or potential
danger.
depleted uranium Dense metal [see uranium] removed in
spent fuel rods from nuclear reactors, used in flightcontrol
surface balances and gun ammunition.
depletion layer In semiconductor, region in which
mobile carrier charge density is insufficient to neutralise
net fixed charge density of donors (N-type) and acceptors
(P-type). Also known as depletion barrier or zone.
deployable simulator Installed at front-line airbase or
aboard carrier.
deployment 1 Strategic relocation of forces to desired
area of operation.
2 Extension or widening of front of military unit.
3 Change from cruising approach, or contact disposition,
to formation for battle.
4 Process from pulling ripcord to fully opened parachute.
5 Extension of solar panels from spacecraft.
6 Basic meaning of word: to use a military or naval
aircraft operationally.
deploy range Range of combat aircraft on transfer from
one theatre to another, if necessary with internal or
external auxiliary fuel.
DEPM Data evaluation program manager[s] (ATOS).
Depos Departure co-ordination system (ATC).
depot-level maintenance Performed at a specialized overhaul
facility, remote from user unit.
depreservation run Test run of machinery after storage,
to validate performance.
depressed-datum reheat Engine control mode for jet
STOVL giving reheat operation at low (dry) thrust levels,
giving smooth auto control to max. thrust.
depressed-sightline attack Shallow dive.
depressed trajectory Flight profile of ballistic missile,
esp. SLBM, fired over relatively short range with altitude
kept low to reduce exposure to defending radars.
depression 1 Region of relatively low barometric pressure,
also known as cyclonic area or low; secondary * is
small low accompanying primary.
2 Negative altitude, angular distance below horizon.
DEPS Directed Energy Professional Society (US).
depth Aerospace meanings include * of depression, * of
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