| Acronym | Meaning |
 | IPS | IRIS Italian Research Interim Stage |
| PAF | Payload Attach Fitting |
| MDCA | Main Distribution Control Assembly |
| OWF | OPtimum Working Frequency |
| RMA | Renote Manipulator Arm |
| SERV | Service |
| IV | Interior Upper Stage |
| KPD | KSC Program Directive |
| PRC | PlanningResearchCorporation |
| SMTAS | Shuttle Model Test And Analysis System |
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