O&C | operations and checkout |
O&C | operations and control |
O&FS | operations and flight support |
O&M | operations and maintenance |
O&P | operations and procedures |
O&R | overhaul and repair |
O&S | operational and support |
O&S | operations and support |
O/B | on board |
O/B | operational base |
O/C | operations critical |
O/D | on dock |
O/D | outside diameter |
O/F | oxidizer-to-fuel ratio |
O/L | overload |
O/L-RC | overload reverse current |
O/R | outside radius |
O/R | oxygen relief |
O/V | overvoltage |
O/V-U/V | overvoltage/undervoltage |
OA | Office of Applications |
OA | omnidirectional antenna |
OA | operational aft |
OA | operational instrumentation MDM aft |
OA | orbit adjust (telemetry) |
OA | orbiter assembly |
OA | output axis |
OA | overall |
OAA | ORU alternative analysis |
OAA | orbiter access arm |
OAA | orbiter alternate airfield |
OAB | Ordnance and Assembly Building |
OAFD | orbiter aft flight deck |
OAFTO | Orbiter Atmospheric Flight Test Office |
OAHTS | orbiter avionics hardware tracking system |
OAL | overall level |
OALC | Ogden Air Logistics Center |
OAME | orbital attitude and maneuvering electronics |
OAMP | Optical Airborne Measurements Program |
OAMS | orbital attitude and maneuvering system |
OAO | orbital astronomical observatory |
OAR | off-axis rejection |
OARE | Orbital Acceleration Research Experiment |
OARME | Oxygen Atom Reaction Materials Experiment |
OARS | Orbiter Avionics Radiation Specification |
OAS | office automation system |
OAS | optical assembly simulator |
OAS | orbiter aeroflight simulator |
OAS | orbiter atmospheric simulator |
OAS | orbiter avionics simulator |
OAS | orbiter avionics system |
OASCB | Orbiter Avionics Software Control Board |
OASIS | Orbit Avionics Software Integration Study (IBM's) |
OASIS | oceanic and atmospheric scientific information system |
OASIS | orbiter experiment autonomous supporting instrumentation |
OASM | Office of Aerospace Medicine (NASA) |
OASPL | overall sound pressure level |
OAST | Office of Aeronautics and Space Technology |
OAT | operational acceptance test |
OAT | overall test |
OATS | orbiter avionics tracking system |
OB | on board |
OB | operational base |
OB | outboard |
OBC | on-board checkout |
OBC | on-board computer |
OBCO | on-board checkout |
OBCP | on-board computer program |
OBCS | on-board checkout subsystem |
OBDU | on-board diagnostic unit |
OBS | operational bioinstrumentation system |
OBS | operational biomed sensor |
OBS | operational biomedical system |
OBV | oxidizer bleed valve |
OC | on center |
OC | on condition |
OC | open circuit |
OC | orbital check |
OC | over center |
OC | overcurrent |
OCA | orbiter capability analysis |
OCA | orbiter capability assessment |
OCAC | orbiter cabin air cleaner |
OCALC | Oklahoma City Air Logistics Center |
OCB | operational configuration baseline |
OCC | Office of Contract Compliance |
OCC | Operations Control Center |
OCCP | orbit command computer program |
OCCS | operator control console subsystem |
OCD | operational concept document |
OCD | operations concept documentation |
OCDR | orbiter critical design review |
OCDU | optics coupling data unit (G&N) |
OCE | Ocean Color Experiment |
OCF | on-board computational facility |
OCF | orbiter computational facilities |
OCH | orbiter common hardware |
OCI | organizational conflict of interest |
OCM | optical countermeasure |
OCN | operation control number |
OCN | order change number |
OCN | order control number |
OCO | OMS cutoff |
OCO | open-close-open |
OCP | Office of Commercial Programs |
OCP | operations checkout procedure |
OCP | output control pulse |
OCR | operational capability readiness |
OCR | operational concept review |
OCR | optical character reader |
OCR | optical character recognition |
OCS | on-board checkout system |
OCS | operational control segment |
OCU | ordnance control unit |
OD | observational data (telemetry) |
OD | operational downlink |
OD | operations directive |
OD | operations director |
OD | outside diameter |
OD | oxygen drain |
OD&E | operational demonstration and evaluation |
ODA | optical diagnostic assembly |
ODB | operational data base |
ODB | operational data book |
ODC | other direct costs |
ODCDR | orbiter delta CDR |
ODDL | on-board digital data load |
ODDP | object-dependent data processor |
ODDS | operational data delivery services |
ODDTE | Office of the Director, Defense Test and Evaluation |
ODE | operational demonstration and evaluation |
ODES | Optical Discrimination Evaluation Study |
ODF | orbit determination facility |
ODF | output data formatter |
ODIN | orbital design integration system |
ODM | orbiter disconnect mechanism |
ODOP | offset Doppler (tracking system) |
ODP | operational display procedure |
ODR | output data redundancy |
ODRAN | operational drawing revision advance notice |
ODRC | Orbiter Data Reduction Center |
ODU | output display unit |
OEAS | orbital emergency arresting system |
OEC | other early capability |
OECO | outboard engine cutoff |
OEM | original equipment manufacturer |
OEPS | operationally efficient propulsion system |
OES | orbiter emergency site |
OESS | orbiter/ET separation system |
OET | orbiter engineering and test |
OEX | orbiter experiment |
OEXP | Office of Exploration |
OF | operational forward DSC or MDM |
OF | operational instrumentation MDM forward |
OF | orbital flight |
OF | outside face |
OF | oxygen fill |
OFCC | Office of Federal Contract Compliance |
OFCCP | Office of Federal Contract Compliance Programs |
OFDS | orbiter flight dynamic simulator |
OFDS | oxygen fluid distribution system |
OFI | operational flight instrumentation |
OFK | optical flight kit |
OFP | operational flight profile |
OFP | operational flight program |
OFP | orbiter flight program |
OFS | orbital flight system |
OFS | orbiter flight simulator |
OFS | orbiter flight system |
OFS | orbiter functional simulator |
OFT | operational flight test |
OFT | orbital flight test |
OFT | orbital flight training |
OFTDS | orbital flight test data system |
OFVR | out-of-field-of-view rejection |
OG | outer gimbal (roll) |
OG | oxygen gage |
OGA | outer gimbal angle |
OGA | outer gimbal axis |
OGE | operating ground equipment |
OGMT | orbiter Greenwich mean time |
OGTM | one-g trainer and mockup |
OGV | oxygen gage valve |
OH | overhaul |
OH | overhead |
OHA | operating hazard analysis |
OHA | orbital height adjustment maneuver |
OHC | optics hand controller |
OHF | occupational health facility |
OHGVT | orbital horizontal ground vibration test |
OI | operating instruction |
OI | operational increment (software) |
OI | operational instrumentation |
OI | operations interface |
OI | orbiter insertion |
OI | orbiter instrumentation |
OIA | Office of Internal Affairs |
OIA | Office of International Affairs |
OIA | orbiter interface adapter |
OIB | Operating Improvement Board |
OIC | orbital integrated checkout |
OIDB | OI data base |
OIE | orbiter integration engineering |
OII | operations integration instruction |
OIO | operations integration officer |
OIR | open item report |
OIR | operations integration review |
OIS | Optical Imager Study |
OIS | operational intercommunication system |
OIS | orbit injection subsystem |
OIS | orbit inserting system |
OIS | orbit insertion subsystem |
OIS | orbiter insertion system |
OIS | orbiter instrumentation systems |
OISAR | optical inverse synthetic-aperture radar |
OISR | open item status report |
OISS | open item status subsystem |
OISTP | Oxygen-Iodine Supersonic Technology Program |
OIT | orbiter integrated test |
OIT | orbiter integration test |
OIT | orbiter interface test |
OIV | oxidizer isolation valve |
OIVS | orbiter interface verification set |
OJT | on-the-job training |
OL | open loop |
OL | operational left DSC or MDM |
OL | overlay |
OL | overload |
OLDB | on-line data bank |
OLERD | orbiter landing emergency rescue data |
OLF | orbiter lifting frame |
OLIF | Orbiter Landing Instrumentation Facility |
OLOW | orbiter lift-off weight |
OLSA | orbiter/LPS signal adapter |
OLSP | Orbiter Logistics Support Plan |
OM | office management |
OM | operational mid DSC or MDM |
OM | operations manager |
OM | optical master |
OM | outer marker (ILS) |
OMA | operations maintenance area |
OMA | operations management application |
OMA | orbiter maintenance area |
OMAS | operations management application software |
OMB | Office of Management and Budget |
OMBUU | orbiter midbody umbilical unit |
OMCF | Orbiter Maintenance and Checkout Facility |
OMCF | operations and maintenance control file |
OMCS | operations and maintenance communications system |
OMD | operations and maintenance documentation |
OMDR | operations and maintenance data record |
OME | orbital maneuvering engine |
OME | orbiter main engine |
OMET | orbiter mission elapsed time |
OMEWG | Orbiter Maintenance Engineering Working Group |
OMGA | operations management ground application |
OMI | operations and maintenance instruction |
OMIJC | operations and maintenance instruction job card |
OMISS | operation and maintenance instruction summary sheet |
OMK | orbiter mission kit |
OML | orbiter mold line |
OML | outer mold line |
OMMH | orbiter maintenance man-hour |
OMP | operating maintenance plan |
OMP | operations and maintenance plan |
OMPR | operational maintainability problem reporting |
OMPT | observed mass point trajectory |
OMR | operations and maintenance requirement |
OMR | operations management room |
OMR | orbiter management review |
OMRB | Operating Material Review Board |
OMRC | operational maintenance requirements catalog |
OMRF | Orbiter Maintenance and Refurbishment Facility |
OMRF | Orbiter Modification and Refurbishment Facility |
OMRP | operations and maintenance requirements plan |
OMRS | operations and maintenance requirements and |
OMRS | operations and maintenance requirements system |
OMRSCB | Operations and Maintenance Requirements and Control Board |
OMRSD | operations and maintenance requirements and specifications document |
OMS | operations management system |
OMS | orbital maneuvering system (subsystem) |
OMSP | operational maintenance support plan |
OMU | optical measuring unit |
OMV | orbital maneuvering vehicle |
OMV | oxygen manual valve |
ONBT | orbiter neutral buoyancy trainer |
OND | operator need date |
ONR | Office of Naval Research |
ONSCOSTS | operation and support costs model |
OOD | object-oriented data base |
OOD | object-oriented design |
OOD | orbiter on dock |
OODP | out-of-detent pitch |
OODR | out-of-detent roll |
OOH | Orbital Operations Handbook |
OOMM | Organizational Operations and Maintenance Manual |
OOP | out of position |
OOR | on-orbit review |
OOS | on-orbit station |
OOS | orbit-to-orbit Shuttle |
OOS | orbit-to-orbit stage |
OOSD | on-orbit support document |
OOSD | orbital operations support document |
OOSDP | on-orbit station distribution panel |
OOSS | on-orbit support system |
OOT | out of tolerance |
OP | operating procedure |
OP | oxygen purge |
OP&R | operations planning and requirements |
OPA | operations planning analysis |
OPB | oxidizer preburner |
OPBOV | oxidizer preburner oxidizer valve |
OPBS | orbiter payload bay simulator |
OPD | optical path difference |
OPDAR | optical detection and ranging |
OPE | operational processing equipment |
OPE | other project element |
OPEIU | Office and Professional Employees International Union |
OPF | Orbiter Processing Facility |
OPGUID | optimum guidance technique |
OPI | operations procedure instruction |
OPI | orbiter payload interrogator |
OPIDF | operational planning identification file |
OPIS | orbiter prime item specification |
OPL | open problem list |
OPL | orbiter project parts list |
OPLF | Orbiter Processing and Landing Facility |
OPM | Operations Procedure Manual |
OPM | outer planet mission |
OPO | Orbiter Project Office |
OPOV | oxidizer preburner oxidizer valve |
OPP | other physical principles |
OPPAR | orbiter project parts authorization request |
OPPG | operating program (DIU) |
OPPS | operations planning and project support |
OPR | office of primary responsibility |
OPR | operations planning review |
OPR | orbiter payload recorder |
OPR | oxygen pressure regulator |
OPRV | oxygen pressure relief valve |
OPS | operational sequence |
OPS | orbiter project schedule |
OPS | oxygen purge system |
OPSDB | operations data base |
OPSDBA | operations data base administrator |
OPSS | orbital propellant storage subsystem |
OPT | operational pressure transducer |
OPTB | operational program time base |
OPWS | orbital payload work station |
OR | operational right DSC or MDM |
OR | operations requirement |
OR | operations review |
OR | operations room |
OR | outer roll |
OR | oxygen relief |
ORA | operational requirements analysis |
ORACLES | optical regulator algorithms for the control |
ORAM | output random access memory |
ORB | Operations Review Board |
ORC | operations request card |
ORCHIS | Oak Ridge computerized hierarchical information system |
ORCUS | orbital recording capability and update system |
ORD | operational readiness data |
ORD | operational ready data |
ORD | operations requirements document |
ORD | orbital requirements document |
ORE | output request element |
OREO | OMS/RCS engineering officer |
ORI | operational readiness inspection |
ORLA | optimum repair level analysis |
ORP | OFS retransmission processor |
ORR | Orroval Valley, Australia (STDN) |
ORR | operational readiness review |
ORR | operations requirements review |
ORS | orbital refueling system |
ORS | orbital reservicing system |
ORS | orbital resupply system |
ORSDI | Oak Ridge selective dissemination of information |
ORT | operational readiness test |
ORT | orbit readiness test |
ORU | orbital replaceable unit |
ORU | orbital replacement unit |
ORV | orbital research vehicle |
OS | on-orbit station |
OS | operating software |
OS | operating system |
OS | orbiter CEI specification |
OSA | operational support area |
OSC | Operations Support Center |
OSC | Operations Support Contract |
OSC | optical signatures code |
OSCF | Operations Support Computing Facility |
OSCN | orbiter specification change notice |
OSCR | orbiter software change request |
OSCRS | orbital spacecraft consumables resupply system |
OSD | Office of the Secretary of Defense |
OSDH | Orbiter System Definition Handbook |
OSE | operating support equipment |
OSE | orbital support equipment |
OSE | orbiter support equipment |
OSE | other support equipment |
OSEC | operations security |
OSES | operation support equipment/software |
OSF | orbiter simulation facility |
OSF | ordnance storage facility |
OSHA | Occupational Safety and Health Act |
OSHA | Occupational Safety and Health Administration |
OSHA | operating and support hazard analysis |
OSI | open system interconnect |
OSI | open systems interconnection |
OSID | operating system interface definition |
OSLM | operations shop or lab manager |
OSM | on-orbit spares model |
OSM | operational status monitoring |
OSM | orbiter service module |
OSMP | operational support maintenance plan |
OSO | ocean systems operation |
OSO | orbiting solar observatory |
OSOP | orbiter systems operating procedure |
OSR | operations support room |
OSR | optical surface reflector |
OSRBD | operational software reliability benchmark development |
OSS | Office of Space Sciences |
OSS | operational SDI system |
OSS | optics subsystem |
OSS | orbiting space station |
OSSA | Office of Space Sciences and Applications |
OSSIU | orbiter-Space Station interface unit |
OSSRH | Orbiter Subsystem Requirements Handbook |
OST | Operations Support Team (GSFC) |
OST | orbiter support trolley |
OSTA | Office of Space and Terrestrial Applications |
OSTDS | Office of Space Tracking and Data Systems |
OSTF | off-site test facility |
OSTO | Office of Space Transportation Operations |
OSTP | orbiting system test plan |
OSTS | Office of Space Transportation Systems |
OT | offensive threat |
OT | operating time |
OT | operational instrumentation MDM tank |
OT | operational test |
OT | operational trajectory |
OT | optical tracker |
OT | out temperature |
OT | overtime |
OT&E | operational test and evaluation |
OT&E | optical test and evaluation |
OTA | operational trajectory analysis |
OTA | optical telescope assembly |
OTB | orbiting tanker base |
OTC | optical test chamber |
OTC | orbiter test conductor |
OTD | operational technical documentation |
OTD | orbiter test director |
OTDA | Office of Tracking and Data Acquisition |
OTE | optical test and evaluation |
OTE | orbital transfer equipment |
OTEC | Operational Test and Evaluation Center |
OTF | operational time fraction |
OTF | optical transfer function |
OTH | over the horizon (radar) |
OTH-B | over-the-horizon backscatter |
OTK | oxidizer tank |
OTL | ordnance test laboratory |
OTLC | orbiter time line constraint |
OTM | output transformation matrix |
OTO | one time only |
OTOS | orbit-to-orbit stage |
OTP | operational test procedure |
OTP | operations turnaround plan |
OTR | operating time record |
OTS | off the shelf |
OTS | orbital test system |
OTS | orbital transfer system |
OTS | orbiter transfer system |
OTT | optional team targeting |
OTV | operational television |
OTV | orbit test vehicle |
OTV | orbital transfer vehicle |
OUP | OFS uplink processor |
OUSDR&E | Office of the Undersecretary of Defense, Engineering |
OUT | orbiter utility tray |
OV | orbiter vehicle |
OV | oxygen vent |
OVCO | Operational Voice Communication Office |
OVDS | oxidizer vent drain system |
OVEI | orbiter vehicle end item |
OVI | operational validation inspection |
OW | optical window |
OW | order wire |
OWD | one-way Doppler |
OWDE | one-way Doppler extraction |
OWF | optimum working frequency |
Orion | communications satellite for service over the Atlantic Ocean |