| Acronym | Meaning |
 | NASA | National Aeronautics And Space Administration |
| FCH | L Flight Control Hydraulics Laboratory |
| VATA | Vibro-Acoustic Test Article |
| CECP | Compatibility Engineering Change Proposal |
| SLS | Spacelab Simulator |
| NO | Normally Open |
| MIR | Malfunction Investigation Report |
| DSN | Deep-Space Network |
| IMPD | Impedance |
| SEC | Secondary |
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