U-SB | unified S-band |
U/B | usage block |
U/C | undercurrent |
U/C | user code |
U/D | update |
U/F | unique file |
U/IP | user/international partner |
U/L | uplink |
U/M | unit of measure |
U/M | unmanned |
U/M | unscheduled maintenance |
U/O | used on |
U/V | undervoltage |
U/W | used with |
UA | unexplained anomaly |
UAC | unattended assembly call |
UAD | user accommodation document |
UAL | United Airlines |
UARS | upper atmosphere research satellite |
UART | universal asynchronous receiver transmitter |
UAW | United Auto Workers |
UB | upper brace |
UB | utility bridge |
UBER | undetected bit error rate |
UC | unsatisfactory condition |
UCAR | unsatisfactory condition action report |
UCC | universal checkout console |
UCD | urine collection device |
UCN | uniform control number |
UCR | unsatisfactory condition report |
UCS | universal control system |
UCS | utilities control system |
UCTA | urine collection transfer assembly |
UDB | update buffer |
UDC | utility distribution center |
UDF | unit development folder |
UDF | utility and data flow |
UDL | up-data link |
UDL | update link |
UDMH | unsymmetrical dimethylhydrazine |
UDMH/H | unsymmetrical dimethylhydrazine hydrazine blend |
UDOP | ultrahigh Doppler |
UDS | universal documentation system |
UDS | utility distribution system |
UE | user equipment |
UER | unique-equipment register |
UFD | user file directory |
UFF | upper forward fuselage |
UHF | ultrahigh frequency |
UHT | umbilical handling technician |
UI | unit of issue |
UI | user interface |
UIIP | user integration implementation plan |
UIMS | user interface management system |
UIWG | User Interface Working Group |
UK | United Kingdom |
UL | underload |
UL | uplink |
UL | upper left (S-band antenna) |
UL | upper limit |
ULA | Fairbanks, Alaska (STDN site) |
ULC | unpressurized logistics carrier |
ULCI | unpressurized logistics carrier interface |
ULE | ultralow expansion (quartz) |
ULI | Underwriters' Laboratories, Incorporated |
ULM | unpressurized logistics module |
ULO | unmanned launch operations |
ULS | upload station |
ULV | unmanned launch vehicle |
UM | unmanned |
UM | unscheduled maintenance |
UMIF | upper mechanical integration frame |
UMO | unmanned orbital |
UMPS | up mission processing start |
UMVF | unmanned vertical flight |
UNEP | United Nations Environmental Program |
UPF | universal patch format |
UPGWA | United Plant Guard Workers of America |
UPL | unapproved parts list |
UPN | unique program number |
UPP | user parameter processor (processing) |
UPS | uninterruptible power system |
UPS | upright perigee stage |
UPWT | unitary plan wind tunnel |
UR | unsatisfactory report |
UR&C | usual, reasonable, and customary |
URA | urine receptacle assembly |
URE | user range error |
US | upper stage |
US | user segment |
USA-2D/3D | unified solutions algorithm 2-dimensional/3-dimensional |
USAF | United States Air Force |
USASDC | U.S. Army Strategic Defense Command |
USASDG | U.S. Army Space Defense Group |
USB | unified S-band |
USB | upper side band |
USBE | unified S-band equipment |
USBI | United Space Booster, Incorporated |
USBS | unified S-band system |
USC | upper stage contractor |
USCG | United States Coast Guard |
USE | unique support equipment |
USE | unobtrusive sensors and effectors |
USE | user support environment |
USEIT | user station evaluation integration and test |
USFWS | United States Fish and Wildlife Service |
USI | update software identity |
USI | user system interface |
USML-1 | United States Microgravity Laboratory-1 |
USNS | United States Navy ship |
USO | ultrastable oscillator |
USP | uniform specification program |
USPHS | United States Public Health Service |
USRA | Universities Space Research Association |
USS | United States ship |
USS | United States standard |
USS | umbilical separation system |
USS | unmanned space satellite |
USS | upper stage system (PAM-D and interfaces) |
USS | utility support structure |
USSPACECOM | United States Space Command |
USSR | Union of Soviet Socialist Republics |
USVMS | urine sample volume measuring system |
USWA | United Steelworkers of America |
USWB | United States Weather Bureau |
UT | unit tester |
UT | universal time |
UTC | United Technologies Corporation |
UTC | United Technology Center |
UTC | universal test console |
UTC | universal time compensated |
UTC | user time clock |
UTE | universal test equipment |
UTF | Underwater Test Facility |
UTLM | up telemetry |
UTRS | universal trouble reporting system |
UTS | universal test set |
UTS | unmanned teleoperator spacecraft |
UTS | urine transfer system |
UUT | unit under test |
UV | ultraviolet |
UV | undervoltage |
UVAT | ultraviolet automatic tracker |
UVD | undervoltage device |
UVF | unmanned vertical flight |
UVMS | urine volume measuring system |
UVPE | UV/video processing electronics |
UVS | ultraviolet sensor |
UVW | quasi-inertial, right-handed Cartesian coordinate system |
Unis | Unified Information System |