| Acronym | Meaning |
 | MA | Maintenance Ability |
| PEFO | Payload Effects Follow-on Study |
| DDIS | Data Depository Index System |
| EQUIV | Equivalent |
| MY | MMY Man Year |
| SPT | Steering Position Transducer |
| HUL | Hardware Utilization List |
| ARS | Archive And Retrieval Subsystem (PPCU) |
| OHGVT | Orbiter Horizontal Ground Vibration Test |
| PMPL | Preferred Mechanical Parts List |
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