| Acronym | Meaning |
 | ED | Engineering Development |
| LONG | Longitude |
| PQS | Personnel Qualification Standard |
| CETS | Contractor Engineering And Technical Services |
| FD/LC | Fault Detection/location Subsystem |
| PACL | Power Assurance Check Left |
| VSI | Vertical Speed Indicator |
| SEU | System Electronics Unit |
| AIMD | Aircraft Intermediate Maintenance Dept |
| EFR | Equipment Facility Requirements |
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