Inglês/Espanhol
U
- ultra-light aircraft
- ultralight aircraft
- ultralight vehicle
- unaccompanied baggage
- unanticipated yaw
- undercarriage
- undershoot
- underspeed condition
- unidentified baggage
- unmanned aerial vehicle
- unmanned aircraft
- unmanned aircraft system
- unmanned free balloon
- unruly passengers
- unsealed cowling
- US federal aviation administration