| Acronym | Meaning |
 | PF | Probability Of Failure |
| ICAO | International Civil Aviation Organization |
| SSAT | SPace Shuttle Access Tower (now FSS) |
| PRS | Payload Retention Subsystem |
| HQ | Headquarters (HDQ Preferred) |
| NSA | National Standards Association |
| SO | FT Square Feet |
| BP | C |
| P/L | Purchased Labor |
| FEID | Flight Equipment Interface Device |
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