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DGES
5 Dirección General de Aviación Civil (Spain etc).
DGES Director-General Equipment Support; can have
suffix (Air). (UK).
DGI Directional gyro instrument or indicator.
DGIA Dirección General de Infraestructura
Aeronautica (Uruguay).
DGIIA Defence Geographic and Imagery Intelligence
Agency (UK).
DGLR Deutsche Gesellschaft für Luft- und Raumfahrt
[office, Bonn] (G).
DGLRM Deutsche Gesellschaft Für Luft- und
Raumfahrtmedizin (G).
DGM 1 Distance-gone meter (Doppler).
2 Digital-group multiplexer.
DGMS Director-General of Medical Services (RAF).
DGNS Differential global navigation system.
DGNSS Differential global nav-sat system; U adds
unit.
DGON Deutsche Gesellschaft Für Ortung and Navigation
(G).
DGPDM Data-gathering, processing and display
manager.
DGPS Differential GPS.
DGR Dangerous-goods requirements (1ATA).
DGRR Deutsche Gesellschaft Für Raketentechnik und
Raumfahrt (G).
DGSM Director-General of Support Management
(RAF).
DGRST Direction Générale à la Recherche Scientifique
et Technique (F).
DGS 1 Disc-generated signal.
2 Digital-generation subsystem (ECM).
3 Docking guidance system.
4 Deployable ground system [various suffixes] (USAF).
DGSI Drift and groundspeed indicator (Doppler).
DGT Digital GPS translator.
DGTA Dirección General de Transporte Aéreo
(Peru, etc).
DGTE Director-General Test & Evaluation (UK).
DGU Display generator unit.
DGVS Doppler ground velocity system.
DGW Design gross weight.
DGZ Desired ground zero; point on Earth’s surface
nearest to centre of planned nuclear detonation (see actual
ground zero, ground zero).
DH 1 Decision height.
2 Dataflash Header.
DHA Display head assembly.
DHB Dynamic hot bench.
DHDA Digicon header diode array.
DHFS Defence Helicopter Flying School, (RAF
Shawbury, UK).
DHHKHH Aeronautic Association (S. Korea).
DHMI Airports authority (Turkey).
DHO Damped harmonic oscillator.
DHS 1 Data-handling system.
2 Department of Homeland Security [2002–] (US).
DHSA Defence Helicopter Support Authority (UK).
DHUD Diffraction, or diffractive-optics, HUD.
DHV 1 Deutscher Hubschrauber Verband, [helicopter
association; office, D-56581 Melsbach] (G).
2 Deutscher Hängegleiterverband, [hang gliding and
sport parachuting; office, D-83703 Gmund] (G).
DI 1 Daily inspection.
Diane
2 Direction indicator.
3 Director of Intelligence.
4 Duty instructor.
5 Direct-injection.
6 Data interrupt.
7 Dynamic inversion [control of linear system].
D i Induced drag.
DIA 1 Documentation Internationale des Accidents
(DocIntAcc).
2 Defense Intelligence Agency (US).
3 Document interchange architecture (IBM).
4 Data-interaction architecture; DEM adds
demonstrator.
5 Digital interface adaptor card.
diabatic process Process in thermodynamic system with
transfer of heat across boundaries.
diabolo Landing gear with two wheels side-by-side on
centreline of aircraft [esp. MLG].
DIAC Data-Interpretation Analysis Center (US).
diagnostic routeing equipment Automatic or semiautomatic
fault-isolating tester with ability progressively
to narrow down location of fault.
diagonal-flow compressor One in which air flows
diagonally to plane of rotation, centrifugal with axial
component.
Dial Differential-absorption lidar.
dial-a-STOL Notional method of operating CTOLs
from bomb-damaged runways in which weapon/fuel load
is selected according to length of undamaged runway
available.
Dialmet Automated Metar and TAF service.
Dials Digital integrated automatic landing system.
dial your weight Small computer on whose keyboard is
manually inserted all fuel, crew, payload and other onboard
items, displaying MTOW and c.g. position
(colloq.).
diamagnetic Reacting negatively to magnetic field,
developing magnetic moment opposed to it, with
permeability less than 1; includes aluminium, non-ferrous
alloys and corrosion and heat-resistant steels.
diameter 1 That of any circular arcs making up fuselage
external cross-section.
2 In optics, unit of linear measurement of magnifying
power.
3 Of parachute canopy, that while fully spread out on
flat surface.
diametral clearance The total free movement in the
radial direction between the inner and outer races of a ball
or roller bearing.
diametral pitch Ratio of number of teeth on gearwheel
divided by pitch diameter.
Diamond C Highest proficiency award for which
sailplane pilots can qualify.
diamond landing gear Tandem centreline mainwheels,
and outriggers.
diamond roll Precision machine tool for dressing
grinding wheels.
diamonds See shock diamonds.
diamond-wing aircraft Has swept-back front wing
merged at tips into forward-swept rear wing; also called
twin-wing.
Diane 1 Digital integrated attack navigation
equipment.
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