| Acronym | Meaning |
| RTCP | Real-Time Communications Processor |
| CECP | Compatibility Engineering Change Proposal |
| RGAL | Rate Gyro Assembly-Left SRB |
| LPF | Low Pass Filter |
| PMS | Performance Measurement System |
| MMT | Mass Memory Test |
| INTERFACE | FInterface Functional Analysis |
| MSS | Manufacturers Standardization Society |
| ORCHIS | System |
| GS | Glide Slope |