| Acronym | Meaning |
 | LST | Large SpaceTelescope |
| GPU | Ground Power Unit |
| M+R | Maintenance And Refurbishment |
| DRD | Document Requirement Description |
| SMMD | Specimen Mass Measurement Device |
| ELMCH | Electromechanical |
| UCPU | Urine Collection And Pretreatment Unit |
| TIROS | ToPographical Infrared Operations Satellite |
| BUC | Backup Computer |
| MPLN | Maintenance Planning (Data Base) |
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