| Acronym | Meaning |
 | EPOC | External Payload Operations Center |
| IPS | Inertial Reference Integrating Gyro |
| SPS | Shuttle Procedures Simulator |
| HC | Hybrid Computer |
| PCCN | Provisioning Contract Control Number |
| CRT | Cathode Ray Tube |
| ICOU | Inertial Coupling Data Unit |
| ST | Structural |
| SR | Standard Repair |
| UDB | Update Buffer |
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