| Acronym | Meaning |
 | EL | Engineering Instruction |
| SEI | SYstem Engineering Groundrule |
| SEN | Sensor |
| GNCS | GuGNCSGuidance And Navi-oation Control System |
| GP | Group |
| TPM | 1Terminal Phase Midcourse #1 |
| RCS | Reaction Control System (Subsystem) |
| RFA | RF Authorization (Frequency) |
| SFPS | Single Failure Point Summary |
| LOWG | Landing Operations Working Group |
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