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GASP
ward motion of moving parts, unlocking breech, is caused
by piston moved by gas bled from barrel.
GASP General Aviation Strategic Plan, being developed
for 2004–08 (TSA).
gasper system Low-pressure fresh-air supply piped to
individual controllable outputs above each passenger or
serving each crew-member.
gas pressurization Feeding liquid propellant for rocket
engine by piping high-pressure gas to dispel it from tank,
with or without use of flexible liner; eliminates need for
turbopump.
gas producer See gas generator (1) or (3).
Gasrig Universal rendition of GASRWG.
gas ring Spring ring for maintaining gastight seal
between piston and cylinder.
gas rudder See gas vane.
GASRWG General Aviation Safety Review Working
Group [CAA, industry and RAeS, 2002-] (UK).
GASS 1 Garde Aérienne Suisse de Sauvetage (Switz.),
same initials in Italian but SRFW in German.
2 General air and surface situation (NATO).
gassing Replenishing gas balloon with fresh gas to
increase purity or make up for losses.
gassing factor Quantity of gas required by aerostat over
period of one year, ordinarily expressed as percentage of
gas volume.
gas starter Early (1920 onwards) method of starting
multi-engined aircraft using airborne compressor set
supplying compressed air or over-rich mixture to cylinders
of each engine in correct sequence.
gas temperature TET is usually measured between first
stators and rotor, TGT at a point between stages and
EGT can be same as JPT.
Gaston Génération d’APT (auto-programmed tool)
standard pour trajectoires d’outils normalisées (F).
gas triode See thyratron.
gas trunk Duct between gas-bag valve and gas hood.
gas tube Electronic tube (valve) containing gas under
very low pressure.
gas turbine Engine incorporating turbine rotated by
expanding hot gas. In usual form consists essentially of
rotary air compressor, combustion chamber(s), and
turbine driving compressor.
gas-turbine numerology Stations within an engine are
designated by numbers used as inferior suffixes which
vary with engine configuration; in a simple turbojet the
numbers are: 1, entrance to inlet duct; 2, entrance to
compressor; 3, compressor delivery; 4, turbine entry;
5, turbine exit; 6, entry to nozzle; 7, in plane of nozzle. A
two-spool engine with afterburner has numbers 1 to 10. A
different set of suffixes identifies the shafts in a multishaft
engine, 1 being LP, 2 HP or IP, and 3 HP or free-turbine
in a three-shaft engine.
gas valves Both rigid and non-rigid airships require
valves to enable excess pressure in the gas bags or
ballonets to be relieved. Lifting gas is released [automatically
or manually] at the top, and air from valves on the
underside.
gas vane Aerodynamic TVC in jet of rocket (see jet
vane).
gas volume Volume of aerostat gas at SL.
gas welding Fusion welding with hot gas flame; eg oxyacetylene
on steels and oxy-hydrogen on aluminium.
GAT 1 General air traffic.
gating
2 General aviation terminal.
3 Greenwich apparent time.
Gatco, GATCO Guild of Air Traffic Control Officers
[1954-, office GU1 2ND] (UK).
GATE, Gate German Airport Technology and
Equipment ev (association, 34 members).
gate 1 Point of passenger emplanement at airport.
2 Point at which commercial flight starts, or enters
new sector of controlled airspace.
3 Removable lock to limit maximum travel of control
lever (eg throttle) under normal conditions.
4 Position(s) on extended runway centreline above
which inbound aircraft are required to pass at time
assigned by approach control.
5 In air intercept: ‘Fly at maximum possible speed for
limited period’ (DoD).
6 Control electrode of any device, esp. input connection
to FET.
7 To control passage of signal in electronic circuits.
8 Circuit having output and input so designed that
output is energised only when required input conditions
are met, eg AND-*, OR-*, NOT-*
9 Circuit designed to receive signals in small fraction
of principal time interval in radar or control system.
10 Range of fuel/air ratios through which combustion
can be started.
11 Of trajectory, eg speed-record run, specified transverse
apertures in space through which aircraft must pass
to comply with regulations.
12 Of space mission, transverse aperture(s) defined in
width and height at particular time or distance from liftoff
or related to other body in space, through which vehicle
must pass if mission is to accomplish objectives.
gated 1 EM pulse permitted to function only under
control of another pulse, usually synchronized.
2 Limited by gate (3).
gate guardian Aircraft publicly displayed at entrance to
major establishment, esp. air force base.
gate hold Departure held at gate, common if delay
exceeds 5 min.
gate position Particular gate (1) numerically assigned to
flight (7).
gate reader Rapid checker of ticket and boarding pass
located at gate (1).
gate time 1 Agreed time at which flight enters new sector
of controlled airspace.
2 Time at which aircraft passes particular point on
track.
gate-to-gate ATC is usually considered to be effective
between gates (2).
gate valve Valve controlling fluid flow by flat plate
having linear motion across flow channel.
gateway Customs airport, through which pax/cargo can
enter country.
gathered parasheet Parasheet whose periphery is
constrained by hem cord.
gathering Process of bringing guided missile into narrow
pencil beam for subsequent guidance.
gating 1 Process of selecting portions of EM wave which
exist during one or more selected time intervals or which
have magnitudes between selected limits.
2 Use of Q-switching or other control to permit laser to
emit only during exact specified time intervals, esp. when
used in rangefinding mode.
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