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OSTD
OSTD Office of SST Development (DoT, US).
OSTIV Organisation Scientifique et Technique
Internationale du Vol à Voile [gliding; office, NL-2629
Delft] (Int.).
OSTM Ocean-surface topography mission.
OSTP Office of Science and Technology Policy [White
House] (US).
OSTR Optimum- speed tilt-rotor.
OSU Omega/vlf sensor unit.
OSV Ocean station vessel.
Oswatitsch inlet Supersonic inlet/diffuser in form of
body of revolution having pointed conical centrebody
of progressively increasing semi-angle, thus generating
succession of inclined shocks at increasingly coarse angles
all focused on peripheral lip.
OT 1 Oil temperature.
2 Other times, or over time.
3 Operational test.
o/t Other times.
OTA 1 Office of Technology Assessment (Congress,
US, from 1972).
2 Orbital transfer assembly.
3 Over the [or overflight] top attack.
4 Other transaction agreement[s].
OTAA Office of Trade Adjustment Assistance (US).
OTAEF Operational Test & Evaluation Force (but see
OTE, OT&E).
OTAES Optical technology Apollo extension system.
OTAN NATO (F).
OT&E Operational test and evaluation.
OTAR Over-the-air re-keying.
OTAS On top and smooth.
OTC 1 Operational training course (USAF).
2 One-stop tour charter.
3 Overseas Telecommunications Commission of
Australia.
4 Operational [or official] test centre.
5 Officer in Tactical Command.
OTCIXS Officer in tactical command information
exchange system.
OTD 1 Origin to destination.
2 Optimal terminal descent.
3 Optical-transient detector.
4 Other training devices.
OTDA Office of Tracking and Data-Acquisition
(NASA).
OTDF Outlet temperature distribution factor.
OTE National telecommunications organisation
(Greece).
OTE, OT&E Operational test and evaluation [A adds
Agency, C adds Command] (USA).
OTER Over-temperature emergency rating.
Otevfor Operational test and evaluation for operational
requirements (USN).
OTFP Operational traffic flow planning.
OTH 1 Over the horizon; hence * radar.
2 Other.
OTH-B Over the horizon, backscatter.
other ranks Soldiers who are not yet NCOs, army equivalent
of airmen (UK).
OTH-R Over the horizon, radar.
OTH-SW Over the horizon, surface wave.
OTH-T, OTHT Over the horizon, target[ting].
OTIS 1 Optronic tracking and identification system.
outbrief
2 Optimal trajectories by implicit simulation.
OTLK Outlook.
OTN Optical transport network.
otolith Organ of inner ear sensitive to attitude and acceleration.
OTP 1 Office of Telecommunications Policy (White
House, US).
2 On-top position [ie, above submerged submarine].
3 Operation[al] test programme [S adds set].
OTPI On-top position indicator.
OTPS Oceanic traffic-planning system (FAA).
OTQ Over-temperature qualification.
OTR 1 Operational turn-round.
2 Oceanic transition route.
3 Other.
4 Overberg Test Range (S Africa).
5 Operational Test and Readiness; R adds Review.
OTS 1 Over the shoulder.
2 Orbital test satellite.
3 Out of service.
4 Organized track system[s].
5 Off the shelf.
6 One-man ticketing system, or structure.
OTSC Optical transmissive star copier.
OTSI Operating time since inspection.
OTT Operational Test Team (DoD).
Otto cycle General name for four-stroke spark-ignition
cycle for piston engine.
OTU Operational training unit.
OTV 1 Orbital transfer vehicle.
2 Obstruction to vision.
OTW 1 On the wing; hence * replacement of engine
module.
2 Over the wing; B adds bridge.
OTWD Out-the-window display (simulator).
OU Operations unit.
OUBD Outbound.
OUE Operational utility evaluation.
ounce Imperial mass, contrary to SI: 28.3495 g; reciprocal
0.0352739; abb. oz.
OUSD Office of the Under-Secretary of Defense (US).
out 1 Radio procedure word: conversation is completed.
2 Unserviceable.
3 When applied to airbrake[s], normally means in use,
not out of use.
outage 1 Loosely, failure to function, especially of
communications.
2 Period during which communications station is
faulty.
outboard 1 In direction from centreline to wingtip.
2 Further from centreline (eg * engine, in relation to
other[s] on same side).
3 Carried outside main structure.
outbound 1 Towards destination; hence VOR * radial.
2 Away from Conus (US military usage).
3 In holding pattern, side opposite to inbound (which
heads towards holding fix).
outbound bearing That of outbound leg of holding
pattern or of VOR radial en route to destination or next
waypoint.
outbound radial That linking fix or beacon to next
waypoint.
outbrief Short list of key items which captain runs
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