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OOH
OOH Out of operating hours.
OOK Department of special constructions (USSR,
obs).
OOOI Out [from gate], off [T-O], on [landed], in [at
gate] (Acars).
OOP Object-oriented programming.
OOR Out of region.
OORA Object-oriented requirements analysis.
OOS 1 Department of special aircraft construction
(USSR, obs).
2 Out of service.
OOSA Office for Outer Space Affairs (UN).
OOTW Operations other than war.
OOV Objects of verification.
OOW Out of window, simulator depicts external scene.
OP 1 Observation post, position or point.
2 Oil pressure.
3 Operating procedure.
4 Overhead panel.
op An operational flight, hence ops.
OPA 1 Component of GB Sarin, isopropylamine plus
isopropylalcohol.
2 Office of Price Administration (US).
3 Opaque (icing).
4 Open planar array.
5 Optionally piloted aircraft.
OPAC Operations of aircraft [ECAC working group].
OPACI, Opaci Opera Pionieri e Anziani dell’Aviazione
Civile Italiana.
opacity In optical systems or photographic film, reciprocal
of transmittance (log O = density d); term
absorbance is now recommended.
OPAL, Opal 1 Order processing automated line.
2 Orbiting picosat automated launcher.
Opale Optical piloted aircraft long-endurance.
opaque plasma One through which EM signals cannot
pass; generally plasma is opaque for EM frequencies
below plasma frequency.
opaque rime White icing of porous form caused by rapid
freezing of small droplets.
OPAS, Opas 1 Overhead-panel Arinc-629 system.
2 Operational assignment (ICAO).
OPAT Office des Ports Aériens de Tunisie.
Opats Object-position and tracking sensor.
OPB Oxygen preburner.
OPBC Overhead-panel bus controller.
Op By Operating authority.
OPC 1 Operational control (ICAO).
2 Optical-phase conjugation.
Opcom Operational command.
OPCW Organizaton for the Prohibition of Chemical
Weapons.
OPD Oil-pressure diffuser.
Opdef Operational defect.
OPEC, Opec Organisation of Petroleum Exporting
Countries.
open 1 Aircraft has * cockpit with no canopy.
2 With normal control path disconnected; such failure
interrupts or seriously distorts signal passing along that
channel.
3 Another meaning is that customer has not yet decided
something, such as which of two competing engines to
select for new fleet.
open angle Angle of mating part slightly greater than 90°
open rate
or other angle of edge of metal structure such as angle
section; fault condition in sheet metalwork.
open architecture Easily added to or modified.
Open Aviation Area Proposed [from 2003] EU-US
agreement on N Atlantic carriers, covering ownership,
sabotage and many other issues.
open-bladed Not enclosed in a shroud or duct.
open-centre system Hydraulic system without an
accumulator.
open circuit 1 Electrical, circuit interrupted.
2 Wind tunnel, one having no return path.
Open Class FAI/CIVV categories for competition
sailplanes, in one case with Standard Class span of 15 m
and alternatively with span unrestricted but usually 17 to
20 m. In each case all refinements such as flaps are
permitted.
open cockpit Not provided with a canopy, leaving occupant’s
head [and possibly upper torso] in slipstream.
open-coil armature Ends of each coil connected to
different bars of commutator.
open competition Industrial competition in which all
proposals, promises or offers are communicated to
all participants.
open cycle Thermodynamic cycle in which the working
fluid passes through the system once, then being
discharged to atmosphere. All existing aero engines are of
this type.
open delta Three-phase transformer comprising two
single-phase transformers linking three lines.
open-ended Spaceflight continued until either all
possible information has been gained, and mission objectives
met, or spacecraft systems run low or become faulty.
open-gore Parachute in which fabric is absent from one
gore to assist trajectory control.
open-hearth Principal method of high-quality steelmaking
in many countries, using shallow regenerative
furnace with or without oxygen.
open improved site Open-air site for military storage
whose surface has been graded and surfaced with topping
or hard paving.
open items 1 Work done on sections of airframe at location
away from assembly line prior to major join.
2 The sections worked on in [1].
3 Parts or procedures inadvertently omitted during
manufacture.
open-jaw ticket Generally, airline booking out by one
route and return by another or over return route to
different destination.
open-jet tunnel Wind tunnel in which working section is
open and has no tunnel walls.
open-link ammunition Rounds are held in clips that do
not encircle each case, which can be pushed out diagonally
instead of removed only to rear.
Open List List of military aircraft on which nothing was
secret (RAF 1918 – c1960).
open loop Servomechanism or other system comprising
control path only, with no measurement of result or feedback
to give self-correcting action.
open production line Inactive, but in a state ready to
resume production should further aircraft be required.
open propfan Propfan or UDF without a surrounding
shroud.
open rate Situation in which fares on particular aircarrier
route are fixed by each operator independently.
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