| Acronym | Meaning |
 | LCB | Least Common Bit |
| D | LSC Data Link Transmission Repeater |
| ET-SEP | External Tank Separation |
| OIL | Operations Integration Instruction |
| PICS | Photo Index And Cataloging System |
| CWSU | Caution And Warning Status Unit |
| BBC | Before Business Clearance |
| SD | Smoke Detector |
| ESE | Electronic SuPport Equipment |
| TD | Time Delay |
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