| Acronym | Meaning |
![](file.png) | OGS | Quantity Gaging System |
![](file.png) | OGV | Oxygen Gage Valve |
![](file.png) | OH | Overhaul |
![](file.png) | OH | Overhead |
![](file.png) | OHA | Operational Hazard Analysis |
![](file.png) | OHA | Orbital Height Adjustment Maneuver |
![](file.png) | OHC | Onboard Hard Copier |
![](file.png) | OHC | Optics Hand Controller |
![](file.png) | OHF | Occupational Health Facility |
![](file.png) | OHGVT | Orbiter Horizontal Ground Vibration Test |
![](file.png) | OHMM | Ohmmeter |
![](file.png) | OI | Operational Instrumentation |
![](file.png) | OIA | Office Of International Affairs |
![](file.png) | OIA | Orbiter Interface Adapter |
![](file.png) | OIB | Orbiter Interface Box |
![](file.png) | OIC | Orbiter (Orbital) Integrated Checkout |
![](file.png) | OIL | Operations Integration Instruction |
![](file.png) | OIR | Operations IntegrationReview |
![](file.png) | OIS | Operational Intercommunication System |
![](file.png) | OIS | Orbiter Instrumentation Systems |
![](file.png) | OISR | Open Item Status Report |
![](file.png) | OISSP | Office Of Interim Space Station Program |
![](file.png) | OIT | Orbiter Integrated Test |
![](file.png) | OIV | Oxidizer Isolation Valve |
![](file.png) | OIVS | Orbiter Interface Verification Set |
![](file.png) | OJT | On-the-Job Training |
![](file.png) | OL | Open Loop |
![](file.png) | OL | Operational Left DSC Or MDM |
![](file.png) | OLDB | On-Line Data Bank |
![](file.png) | OLDR | Quick Look Data Reference |
![](file.png) | OLF | Orbiter Landing Facility (now SLF) |
![](file.png) | OLIF | Orbiter Landing Instrumentation Facilities |
![](file.png) | OLOW | Orbiter Lift-off Weight |
![](file.png) | OLSA | Orbiter/LPS Signal Adapter |
![](file.png) | OLSP | Orbiter Logistics Support Plan |
![](file.png) | OM | Operational Mid DSC Or MDM |
![](file.png) | OM | Optical Master |
![](file.png) | OM | Orbital Maneuvering Engine |
![](file.png) | OM | Orbiter Main Engine |
![](file.png) | OM | Outer Marker (ILS) |
![](file.png) | OM | RS Operations And Maintenance Requirements Specification |
![](file.png) | OMA | Operations Maintenance Area |
![](file.png) | OMA | Orbiter Maintenance Area |
![](file.png) | OMB | Office Of Management And Budget |
![](file.png) | OMBUU | Orbiter Midbody Umbilical Unit |
![](file.png) | OMC | Orbiter Maintenance And Checkout |
![](file.png) | OMCF | Operations And Maintenance Control File |
![](file.png) | OMCF | Orbiter Maintenance And Checkout Facility |
![](file.png) | OMD | Operations And Maintenance Documentation |
![](file.png) | OMD | Orbiter Mating Device |