| Acronym | Meaning |
 | SRR | System Requirements Review |
| SPA | Steering Position Amplifier |
| STP | Self-Test Program |
| RFEI | Request For Engineering Information |
| PPF | Payload Processing Facility (USAF) |
| SD | Scaling And DisPlay |
| MTO | Mission |
| LC | Integrated Circuit |
| SEPAP | Shuttle Electrical Power Analysis Program |
| SCR | Software Change Request |
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