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GPIB
GPIB General-purpose instrument bus, or interface
board.
GPIIA Groupement Professionel des Industriels
Importateurs de l’Aéronef (F).
GPIN Global positioning [laser]-inertial navigation.
GPIO General-purpose input/output.
GPIRS See GPADIRS.
GPM 1 Glass polycarbonate mix.
2 Global precipitation measurement.
3 General-purpose processing module.
gpm Gallons per minute (also gal/min).
GPMG General-purpose machine gun.
GPMS GPS performance-monitoring sys.
GPP 1 Graphic part-programming; technique for
communicating with computer by words and diagrams,
conveying pictures of shape required and operations
necessary to produce it.
2 Generative process planning, basis for implementing
FMS (7).
3 General-purpose processor.
GPPE General-purpose processing element.
GPPPA, GP 3 A Groupement Pour la Préservation du
Patrimoine Aérien (F).
GPR Glider Pilot Regiment [1942–57] (UK).
GPRA Glider Pilot Regimental Association [1945–;
Benfleet SS7 5JQ] (UK).
GPRS General packet radio services; see packet (3).
GPS Global positioning system, or satellite (Navstar);
ANT adds antenna, L1/L2/L5 see these entries.
GPSCS General-purpose satellite communications
system.
GPS-HMU GPS height measuring unit.
GPSI GPS interferometer.
GPSS General-purpose simulation software.
GPSSU GPS sensor unit.
GPT Glidepath tracking.
GPTE General-purpose test equipment.
GPTN General-purpose telephone network.
GPU 1 Ground power unit.
2 Gun pod unit.
GPVI Graphic[s]-processor video interface.
GPW Ground-proximity warning [C adds computer, S
system, SU sensor unit].
GR, G/R 1 Green run.
2 Ground attack, reconnaissance (role prefix, UK
current).
3 General reconnaissance, ie Coastal Command (role
prefix, UK, WW2).
4 Ground relay, or router.
5 Groupe de Reconnaissance (F).
6 Hail.
Gr 1 Net climb gradient.
2 Graphite.
3 Grashof number.
G R , G r Rudder actuator.
GRA Geared rotary actuator.
grab Tendency of wheel brakes to increase power
suddenly without pilot input.
grabbit Long boathook carried on large marine aircraft.
grab line See handling line.
Grace Gravity recovery and climate experiment
(US/G).
GRAD, Grad Gradient.
Grand Slam
grad Non-SI unit of plane angle, = 0.9° = 1.5708 10 –2
rad.
grade 1 Of fuel, see fuel grade.
2 Unit of plane angle, defined as 0.9°.
Grade-A Standard aircraft cotton fabric, long
staple with 80 threads per inch across both warp and weft
(US = fill).
graded fibre Standard form of reinforcing-fibre raw
material supplied according to diameter, length or other
variable.
gradient 1 Of net flightpath, has normal meaning,
h/D%; note runway * = slope.
2 Space rate of decrease of function; if in three dimensions,
vector normal to surfaces of constant value directed
towards decreasing values. Ascendent is negative of *.
3 Loosely, magnitude of either * or ascendent.
4 Rate of change of quantity, or slope of curve when
plotted graphically.
gradient distance Linear distance from encounter with
gust to point of peak intensity.
gradient of climb See climb gradient.
gradient wind Along isobars with velocity exactly
balancing pressure gradient; equilibrium between force
directed towards region of low pressure and centrifugal
forces.
gradient wind speed Calculated as for geostrophic but
taking into account curvature of trajectory.
grading curve In determining propeller performance by
Drzwiecki theory, forces on infinitely small blade element
are determined; curve of these forces (as the ordinate)
against blade radius is **, from spinner or root and
reaching maximum between 70%–90% tip radius.
Gradu Gradual[ly].
Graetz number, Gz Heat-transfer measure = Cp (specific
heat at constant pressure) times mass flow divided by
thermal conductivity and a length characteristic of body
concerned.
Grafil Registered name (Courtaulds) for carbon-fibre
raw materials.
grain 1 Entire case or extruded charge for solid rocket
motor.
2 Particle of granular solid propellant, usually in gun
ammunition.
3 Particle of metallic silver remaining in photographic
emulsion after developing and fixing; these form dark
area of image.
4 Non-SI unit of weight = 0.0648 g = –––––
1
lb.
7,000
grain orientation Direction of solidification of metal.
GRAM, Gram GPS receiver application module.
gramme Fundamental SI unit of mass [gram in US],
abb, g.
gramme-molecule Mass in grammes of substance
numerically equal to its molecular weight.
gramophone grooving Close-pitch grooves in female part
to form abradable seal round high-speed rotating
member.
Grandfather rights Permanent certificates for their
existing route networks awarded US domestic airlines by
CAB on its formation in July 1940. Hence Grandfather
routes. Today loosely extended to all nations on basis ‘If
you’ve had this right in the past, you’ll probably succeed
in a fresh application’.
Grand Slam RAF 22,000 lb [9,979 kg] deep penetration
bomb of 1944.
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