| Acronym | Meaning |
| PIU | Power Interface Unit |
| MD | MalfunctionDetection |
| OTD | Orbiter Test Director |
| TTA | Thermomechanical Test Area |
| CDS | Collision Detector System |
| DC | DCAADefense Contract Audit Agency |
| DCN | Document Change Notice |
| EIU | Engine Interface Unit |
| SPOM | STS Planning And Operations Management |
| IPAD | Integrated Program For Aerospace Vehicle Design |