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glaze ice
glaze ice Transparent or translucent coating with glassy
surface formed by contact with rain; part freezes on
impact, most flowing back and freezing over surface.
GLC Generator line contactor.
GLCM Ground-launched cruise missile.
GLCS Global launch control system (DoD).
GLD Glider (ICAO).
glid See GLLD.
glide 1 Controlled descent by aerodyne, esp. aeroplane,
under little or no engine thrust in which forward motion
is maintained by gravity and vertical descent is controlled
by lift forces. Rate of descent is given by υ a = (D/L)V
where D is drag, L lift and V TAS.
2 Flightpath of *.
3 To descend in *.
glide bomb Missile without propulsion but with aerofoils
to provide lift and guidance; released from aircraft.
glide landing No-flare landing.
glide mode Flight-control system mode in which aircraft
is automatically held to centre of glideslope.
glidepath 1 Flightpath of aircraft in glide, esp. when
making ILS landing.
2 Glideslope.
glidepath angle That between local horizontal and
straight line representing mean of glideslope.
glidepath beacon ILS outer, middle or inner marker.
glidepath bend Aberration in electronic glidepath.
glidepath indicator ILS panel instrument.
glidepath localizer Contradiction in terms (see localizer).
glidepath sector Sector in vertical plane containing
glideslope and extended runway centreline, limited by loci
of points at which DDM is 0.175.
glider Fixed-wing aerodyne designed to glide, ordinarily
having no internal propulsion (see sailplane).
glide ratio Ratio of horizontal distance travelled to
height lost; TAS Vs (in same units). A common symbol
is R G .
glider flight time Includes time on tow.
glider train Two or more gliders towed in tandem behind
one tug.
glider tug Aircraft used to tow gliders.
glideslope Radio beam in ILS providing vertical
guidance (see ILS).
gliding angle 1 Angle between local horizontal and
glidepath. Traditionally γ = tan -1 D/L where D is drag and
L lift.
2 Shallowest possible * of sailplane.
gliding range Maximum distance that can be reached
from given height in normal glide; also known as gliding
distance.
gliding turn Spiral flight manoeuvre consisting of
sustained turn during glide; also known as spiral glide.
glim lamp Source of illumination dim and local enough
for use during blackout, esp. airfield lighting.
Glint 1 Geostationary Earth orbit light-imaging
national testbed (US).
2 Gated-laser illumination for night TV.
glint Pulse-to-pulse change in amplitude of reflected
radar signals, caused by reflection from object whose
radar cross-section is rapidly changing.
GLIT, Glit Chief State flight-test centre, Akhtyubinsk
(R).
glitch Small voltage surge affecting sensitive device;
later general colloq. for technical problem.
GmbH
GLLD Ground laser locator-designator.
GLM Gear limiting speed [usually means ‘extended’,
rather than ‘cycling’].
GLN GPS landing and navigation; S adds system, U
unit.
GLO Ground liaison officer.
Global Area Network Pioneer worldwide satcom service
providing 64 kbit/s (Inmarsat 1991–).
Global Command and Control System Overall electronic
system tracking, and to some degree controlling, combat
operations worldwide (DoD).
Global distribution system That which apportions
revenue from an air-carrier passenger ticket (Sita).
globalization Distribution through many carefully
selected countries of the companies needed to make and
support a product.
Global positioning and com Gives GPS/TDMA for
numerous linked users, esp. for station-keeping.
Global Positioning System Worldwide system in which
users derive their location by interrogating four satellites
from total net of 24. Originally US military, which
reserves to itself the greatest [centimetric] accuracy.
Globmet Global meteorological service.
GLOC See g-loc.
Glonass Global navigation-satellite system (USSR, R,
India).
glory Aircraft in humid atmosphere viewed from above
or below at centre of rings in spectral [rainbow] colours.
glove 1 Fixed leading portion of wing root, esp. of
variable-sweep wing.
2 Additional aerofoil profile added around normal
wing, usually over limited span, for flight-test purposes.
GLOW Gross lift-off weight (not spoken as word).
glow-discharge anemometer Sensitive method of
measuring gas velocity, esp. at low speeds or in turbulence,
using cathode discharge between two pointed
electrodes about 0.1 mm apart.
glow plug Electric heating element, used in semi-diesel
engines, which aids starting or, in one type of turboprop,
provides inflight relight after flame-extinction.
GLS 1 GPS- or GNSS-based landing system.
2 Gunlaying system.
3 Glider launching site.
GLTD Ground-based laser target-designation.
GLU GPS landing unit.
GLY Galley.
GLUAV Gun-launched unmanned aerial vehicle.
glycerin Glycerol, compound of C/H/O, soluble in
water/alcohol, constituent of antifreezes.
glycol See ethylene glycol.
glyptal Synthetic resin made from glycerin and phthalic
acid or phthalic anhydride.
GM 1 Ground map mode (airborne radar).
2 Guaranteed minimum.
3 Gain [FCS feedback] margin.
4 Guided missile, usually with prefix.
5 Guidance material.
G/M Gun/missiles selector switch on control column.
gm, g m Location of c.g. as fraction of chord behind
leading edge.
GMADS Ground-based maintenance aid and diagnostic
system.
GmbH Gesellschaft mit beschränk Haftung, incorporated
company (G).
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