| Acronym | Meaning |
 | GSSC | Ground Support Simulation Computer |
| CN | Change Notice |
| OPTB | Operational Program Time Base |
| VIDD | Vertical Interval Data Detector |
| PIC | Pyro Initiator Controller |
| PRSD | Power Reactant Storage And Distribution |
| SSA | 1/0 GCOS Program Element Name |
| NBS | National Bureau Of Standards |
| LOLI | Limited Operational-Life Items |
| FA | Failure Analysis |
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