Aviation Abbreviations Glossary

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Term Main definition
UR
Utilization Rate
UPR
Upper
UPPR
Upper
UPLK
Uplock
UNSD
Unused
UNLKD
Unlocked; Unlocking
UNLK
Unlock
UNIV
Universal
UND
Under
UNCRCTD
Uncorrected
UNCPLG
Uncoupling
UNBAL
Unbalance; Unbalanced
UMS
User Modifiable Software
ULM
Ultra Low Maintenance
ULLI
Understep LED Light
ULD
Unit Load Device
ULB
Underwater Locator Beacon
UICDL
User Interface Configuration Download List
UHF
Ultra High Frequency
UF
Underfrequency
UEB
Underseat Electronic Box
UDP
User Datagram Protocol
UDL
Unit Detail Listing
UDCD
Upper Deck Cargo Door
UDCC
Upper Deck Cargo Compartment