| Acronym | Meaning |
| EU | Electronic Unit |
| PRN | Program Release Notice |
| RBN | Radio Beacon |
| PALS | Precision Approach And Landing SYstem |
| D | LSC DLSMData Link Summary Message |
| FID | Flight Implementation Directive |
| ESI | Electrical System Integration |
| STD | Standard |
| FTRD | Functional Test Requirements Document |
| LSU | International System Of Units |