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| Dictionnaire |
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| U/FLOOR |
Underfloor |
| U/S |
Unserviceable |
| UAC |
Upper Area Control Center |
| UART |
Universal Asynchronous Receiver Transmitter |
| UD |
Document Unit (Unite Documentaire) |
| UDC |
Upper Deck Cargo |
| UDCC |
Upper Deck Cargo Compartment |
| UDL |
Unit Detail Listing |
| UF |
Underfrequency |
| ULB |
Underwater Locator Beacon |
| ULD |
Unit Load Device |
| UNBAL |
Unbalance, Unbalanced |
| UNCPLG |
Uncoupling |
| UNCRCTD |
Uncorrected |
| UND |
Under |
| UNIV |
Universal |
| UNLK |
Unlock |
| UNLKD |
Unlocked, Unlocking |
| UNSD |
Unused |
| UPR |
Upper |
| UR |
Utilization Rate |
| US |
Under Speed |
| US |
United States |
| UTA |
Upper Control Area |
| UTC |
Universal Time Coordinated |
| UUT |
Unit Under Test |
| UV |
Ultra-Violet |
| UV |
Under Voltage |
| UVEROM |
Ultra Violet Eraseable Read Only Memory |
| UWY |
Upper Airway |
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