| Acronym | Meaning |
 | PIIN | Procurement Instrument Identification Number |
 | ETLOW | External Tank Lift-Off Weight |
 | VCU | Video Control Unit |
 | T | Thermostabilized |
 | M | Maintainability |
 | FRCI | Fibrous Refractory Composite Insulation |
 | TY | Translation Hand Controller Y-Axis Direction |
 | R | Replace |
 | STA | Structural Test Article |
 | MCDS | Multifunction CRT Display System |