| Acronym | Meaning |
 | OMS | Orbital Maneuvering Subsystem |
| SPN | Shuttle Project Notice (KSC) |
| FM | Frequency Modulation (Modulated) |
| UTC | United Technology Center |
| VU | Vehicle Utility |
| ECP | Engineering Change Proposal |
| GLP | Goal Language Processor |
| PVA | Propellant Valve Actuator |
| HRDA | High Rate Data Assembly |
| SDN | Software Development Note |
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