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overshoot area
approach; in US called missed approach or go-around, a
term fast becoming universal.
2 To land too far across available landing area and
make uncontrolled excursion into region beyond.
3 To exceed desired IAS, altitude, heading, bank angle
or other flight condition.
4 In an interception, to pass through enemy aircraft’s
future flight path in plane of symmetry.
overshoot area Designated area of semi-prepared
ground available to overshooting (2) aircraft (usually GA
only) from which they may taxi relatively undamaged.
overside vision angle Maximum angle between horizontal
and pilot’s lateral field of view downwards.
overspeed condition Normally applied to rotating
machinery, and permissible for brief specified period and
within specified limit. An exceptional and usually undesired
condition, and in no way synonymous (as claimed in
one source) with takeoff rpm.
oversquare 1 Of an aeroplane [airplane], having length
greater than the span.
2 Of a piston engine, having the bore greater than the
stroke.
overstow position Inoperative position of target-type
reverser with geometry which precludes inadvertent operation
in flight.
overstrain Quantitative extension of material stretched
beyond yield point.
overstress Application of load which could cause structural
failure [particularly positive or negative pitch input
which could break wing].
oversweep Ultra-acute setting of VG pivoted wings [eg,
to make carrier-based F-14 aircraft more compact when
parked].
overswing Undesired azimuth excursion by aircraft with
long, heavy body during fast turn while taxiing, esp. on
slippery surface.
overtake velocity Excess speed over that of aerial target
ahead.
over the fence Immediately before touchdown (colloq.,
normally GA).
over the horizon Beyond the visible or LOS horizon;
region accessible only to particular species of radar.
over-the-shoulder delivery See toss bombing.
over the top On top (1).
over the weather At pressurized cruising levels; basic
meaning is free from turbulence except CAT, but cloud
may still be present and cu-nims must be avoided.
over the wing Aeroplane configuration in which
turbofan is located above wing to give USB powered lift
but without surface scrubbing losses.
overtip leakage Escape of high-pressure fluid around the
small gap between the tips of turbine blades and the
surrounding casing.
overturn boundary Limiting sea state for safe operation
of float or pontoon-mounted helicopter.
overturn pylon Strong structure to protect occupants of
small aircraft in overturn on ground.
overwater Particular provisions apply to commercial
transports for use on sea crossings where power-off glide
to land is not possible. Adjective also applied to extendedrange
versions, irrespective of actual intended routes.
OVHD Overhead.
OVHT Overheat.
oxygen mask
OVI Department for war inventions (of RKKA, USSR,
defunct).
OVR, ovr Over.
ovrd Override.
OVRN, ovrn Overrun.
OVS Overhead video system.
OVT Vectored thrust (R).
OVTR Optical videotape recorder.
OW Oblique (slew) wing.
OWB Over-the-wing bridge (passenger loading).
OWE Operating weight empty.
OWF Optimum working frequency.
OWL 1 On-wing life (main engine).
2 Obstacle-warning ladar.
3 Over water and land.
4 On-target weapon, long-range.
OWLD Obstacle warning, location and detection.
OWM One-way mission.
OWP Outer wing panel.
OWRM Other war reserve materiel (US).
OWS 1 Orbital workshop.
2 Obstacle warning system (helo).
3 Optical weapon sight.
4 Ocean Weather Station.
OWSF Oblique-wing single fuselage.
OWSPS Operational weather squadron production
system (USAF).
OWTF Oblique-wing twin fuselage.
OWWS Operational windshear warning system.
OX, Ox 1 Longitudinal axis about which aircraft rolls;
confusingly, some authorities now make Ox the pitch
[transverse] axis.
2 Oxygen: OX1 HP gaseous, OX2 LP gaseous, OX3 HP
replacement bottles, OX4 LP bottles, no code for liquid.
3 Oil[s] miscellaneous [not covered by OEP, OM or
OMD].
oxidant Chemical carried as rocket propellant for
combination with fuel; examples are lox, nitrogen
tetroxide, nitric acid and mixtures of fluorine and oxygen
(flox).
oxidation 1 Removal of electron from atom or atomic
group.
2 Combination with oxygen, as in burning or rusting.
oxidiser Oxidant (N American usage).
oxidising flame In gas welding or cutting, one having
excess oxygen.
oximeter Instrument giving numerical readout of blood
oxygen concentration.
OXRB Oxygen replacement bottles available.
oxy Oxygen.
oxygen O 2 , odourless gas, vital to life, density 1.43 gl –1 ,
0.089212 lb/ft 3 ; liquid [lox] density 1.1, MPt –218°C, BPt
–183°C. For aircraft breathing purposes, Grade A
mandatory, 99.5% pure, many other requirements
including water 0.005 mg/l. In US OX1/2/3/4 are respectively
HP gas, LP gas, HP replacement bottle and LP
replacement bottle.
oxygen bottle Container for gaseous oxygen under
pressure.
oxygen converter Liquid oxygen converter (ie boiler)
supplying gox to breathing system.
oxygen mask Face mask for supplying gaseous oxygen
to wearer, usually on demand, and separating exhaled
breath.
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