| Acronym | Meaning |
 | PERM | Permanent |
| CCSDSP | Closed Circuit Saturation Diving System |
| STHD | Stored Heading |
| SSER | System Safety Engineering Report |
| FOV | Field Of View |
| BIT | Built-in Test |
| OAF | Open Architecture Framework |
| PMDB | Project Master Data Base (trw Ir&d Project Name) |
| RCM | Reliability Centered Maintenance |
| IRAC | Interim Rapid Action Change |
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