| Acronym | Meaning |
 | T/R | Tape Recorder |
| H | AlH Altitude |
| SSOP | Space Systems Operating Procedure(s) |
| PTT | Push-to-Talk |
| PCMMU | Pulse-Code Modulation Master Unit |
| SLEMU | SPacelab Engineering Model Unit |
| LR | Left Rudder |
| SD | LSoftware Development Laboratory |
| FIO | Furnished And Installed By Others |
| PLN | Program Logic Network |
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