| Acronym | Meaning |
 | HA | High Altitude |
| PID | Program Information Document |
| RCCB | Remote Control Circuit Breaker |
| OSM | Orbital Service Module |
| VHF | Very High Frequency |
| GPA | General Purpose Amplifier |
| MEA | Main Electronics Assembly |
| U/V | Under Voltage |
| OMS | Orbital Maneuvering System |
| CCIM | Command Computer Input Multiplexer |
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