| Acronym | Meaning |
 | SPTD | Supplementary Provisioning Technical Documentation |
| TRK UP | Track Up |
| PDA | Principal Development Activity |
| SCD | Source Control Drawing |
| LWR | Lower |
| SOP | Standard Operating Procedure |
| CAD | Computer Aided Design |
| OMG | Object Management Group |
| TEC | Temporary Engineering Change |
| MSDOS | Micro-soft Disk Operating System |
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