| Acronym | Meaning |
 | EIU | Engine Interface Unit |
| RIS | Reporting Identification Symbols |
| PETA | Performance Evaluation And Trend Analysis |
| MCBF | Mean Cycle Between Failures |
| PDCS | Power Distribution And Control System (Subsystem) |
| SIT | Situation |
| URT | Upright |
| THROT | Throttle |
| E/L | Entry/Landing |
| SSID | Shuttle Stowage Installation Drawing |
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