| Acronym | Meaning |
 | ECA | Electronics Control Assembly |
| CIL | Critical Items List |
| DOC | Document |
| MK | Mark |
| RIV | Recirculation Isolation Valve |
| SP | Shuttle Projects Office (KSC) |
| CIS | Communications Interface System |
| TP | Test Procedure |
| RACU | Remote Acquisition And Command Unit |
| RPL | Rated Power Level |
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