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outburst
through on way to aircraft; can include authorization and
Notams.
outburst Lateral spread across surface of air arriving in
downburst.
outer Further from aircraft centreline, but see * wing.
outer air battle Taking place 100 nm or more from
surface fleet Battle Force, beyond radius of ship-to-air
weapons.
outer area Defined region around airport within which
height of building is severely limited.
outer cover External skin of rigid airship.
outer fix Fix in destination terminal area, other than
approach fix, to which aircraft are normally cleared by
ATC and from which they are cleared to approach for
final approach fix (FAA).
outer loop FCS in autopilot mode, human pilot being
inner loop.
outer marker ILS marker beacon normally on approach
centreline approximately 4½ nm (8.3 km) from threshold;
usually identified by 400 Hz aural dashes and synchronized
blue panel light.
outer panel Left or right wing outboard of centre
section.
outer wing Apart from obvious meaning: in a turn, that
pointing away from centre of turn, experiencing increased
airspeed.
outfall valve Usually synonymous with outflow valve.
outflow 1 Violent low-level wind radiating out from
downburst, or created beneath hovering VTOL aircraft.
2 Slipstream [confusing].
outflow pattern Isobar pattern above wing at positive
angles of attack.
outflow valve That incorporated in isobaric cabinpressure
regulator through which air is allowed to escape
to atmosphere during climb to isobaric altitude.
outgassing Emission of gas from metals and other
materials in high-vacuum conditions.
outlet guide vanes A ring of fixed [rarely, variable] stator
vanes downstream of a fan or compressor. Their purpose
is to remove swirl and produce a truly axial flow.
outlet temperature distribution factor Combustion
chamber outlet peak temperature (T) minus outlet mean
T divided by mean combustion chamber T rise.
out of alignment In case of propeller or rotor blade,
having incorrect sweep (bent forward or back in plane of
rotation).
out-of-control lights Two superimposed red lights 6 ft
(2 m) apart hoisted at night on mast of marine aircraft
whose engines have failed and which is not anchored.
out of phase Not synchronized; two or more cycles or
wavetrains which have same frequencies but pass through
maxima and minima at different times.
out of pitch In case of propeller or rotor blade, having
blade angle different from that of remaining blades.
out of step Not synchronized; two or more series of
digital pulse trains or other discrete phenomena having
essentially same frequency but occurring at different
times.
out of the box First entry to service of new product.
out of track In case of propeller or helicopter rotor
blade, having incorrect tilt so that particular tip does not
lie on tip-path plane.
output 1 Total product or yield from system, eg tonnekm
for airline.
overall length
2 Delivery from computer, as hard copy or graphics
display.
3 One of five basic functional sections of most EDP(1)
systems.
4 Signal from transducer or other instrumentation.
5 Power developed by engine or other prime mover.
6 Shaft at which power is extracted from shaft-drive
engine.
7 Verb, to deliver an * (2), hence outputting.
outriggers 1 Primary structural members carrying tail of
aeroplane with short fuselage, nacelle or boat hull, also
called booms.
2 Ancillary landing gear near wingtip or at other location
well outboard from centreline on aircraft with bicycle
or other type of centreline landing gear.
outshop To complete manufacture, or at least a stage of
manufacture; hence outshopped.
outside air temperature 1 Free-air static temperature
(UK).
2 The uncorrected reading of the OAT instrument,
requiring corrections [e.g., for kinetic heating] to obtain
true static temperature (US).
outside loop Inverted loop, performed with aircraft
upper surface outwards and thus under negative g.
outside roll One started from negative g, esp. from
inverted attitude.
outside wing That on outer side of spin, having greater
airspeed than inside wing.
outsourcing 1 Subcontractor brings in someone else to
help.
2 Airline subcontracts aircraft maintenance.
outspin On outer side of spin, hence * aileron or rudder.
outspin yaw Yaw inevitably present in normal spin,
usually function of pitch attitude.
outturn What actually happened, or a measured value
[as distinct from prediction].
outyears Period during which item is in operational
service (USAF, later general use).
OUV Oskar-Ursinus Vereinigung, association of
amateur aircraft constructors (G).
OV 1 Over-voltage.
2 Aircraft mission code, observation V/STOL (DoD).
3 Outside vendor.
4 Location (ICAO).
5 Orbiting vehicle.
OVA Overside vision angle.
OVAC Main office of national aero club [Vienna A-
1040] (Austria).
ovalisation Structural distortion such that circular parts
become ovals, esp. on pylon-mounted turbofans.
oval office The President of the United States; thus *
green = his authority to proceed.
OVC Overcast.
ovenise To bake electronic device to simulate overload
test condition.
over Radio procedure word: ‘My transmission is ended
and I expect a response from you’.
overall efficiency In case of aircraft propulsion system,
usually thermal efficiency multiplied by propulsive
(Froude) efficiency. η o = ηp η T .
overall length Most definitions for aircraft stipulate in
flying attitude; distance between local perpendiculars
aligned with extremities of basic airframe (but usually
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