| Acronym | Meaning |
 | MTBM | Mean Time Between Maintenance |
 | PMEL | Precision Measurements Equipment Laboratory |
 | MDTSCO | McDonnell Douglas Technical Services Company |
 | D/L | Downlist |
 | ADPS | Acceptance Data Package System |
 | PCM | Pulse Code Modulator |
 | NCGS | Nuclear Criteria Group Secretary |
 | PCS | Procedure Completion Sheet |
 | W/B | Wideband |
 | IVSI | Instantaneous Vertical Speed Indicator |