U.S. DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
Air Traffic Organization Policy

ORDER
JO 7340.2D
Effective Date:
May 2, 2013
 
     

Subject:  Contractions
       Includes: Change 1 effective 8/22/13 and Change 2 effective 12/12/13    
 

[Back to Section 1. Decode]

U

Contraction

Definition

Usage

U

Intensity unknown (weather reports only)

NWS

U/S

unserviceable

ICAO

UA

routine PIREP

ATC

UA

unable to approve arrival for the time specified

ATC

UAB

until advised by

ATC

UAC

upper area control center

ICAO

UAG

upper atmosphere geophysics

NWS

UAR

upper air route

ICAO

UAT

until advised by the tower

ATC

UCDWN

until cleared down

ATC

UCLT

until cleared to land by the tower

ATC

UD

unable to approve departure for the time specified

ATC

UDDF

up and down drafts

NWS

UDF

ultra high frequency direction finding station

ICAO

UERE

User Equivalent Range Error

ATC

UFA

until further advised

GEN

UFN

until further notice

GEN

UFO

unidentified flying object

GEN

UHA

unable higher altitude

ATC

UHDODT

unable higher due opposite direction traffic

ATC

UHDSDT

unable higher due same direction traffic

ATC

UHDT

unable higher due traffic

ICAO

UHDT

unable higher due traffic

ICAO

UHF

ultra high frequency

ICAO

UIC

upper information center

ICAO

UIR

upper flight information region

ICAO

ULDT

unable lower due traffic

ATC

ULR

untra long range

ICAO

UM

unable to maintain

ATC

UN

Unable

GEN

UNA

Unable

ICAO

UNAP

unable to approve

ICAO

UNAPV

unable to approve

GEN

UNAR

unable to approve altitude requested

ATC

UNATNDD

Unattended

GEN

UNAVBL

Unavailable

GEN

UNCC

unable to contact company radio

ATC

UNDLD

Undelivered

GEN

UNEC

Unnecessary

GEN

UNHRD

Unheard

GEN

UNID

Unidentified

GEN

UNKN

Unknown

GEN

UNL

Unlimited

ICAO

UNLGTD

Unlighted

GEN

UNMON

unable to monitor

GEN

UNMON

Unmonitored

ATC

UNOFFL

Unofficial

GEN

UNRDBL

Unreadable

GEN

UNREL

Unreliable

ICAO

UNRELBL

Unreliable

GEN

UNRR

unable to approve route requested

ATC

UNRSTD

unrestricted

GEN

UNSATFY

unsatisfactory

GEN

UNSBL

unseasonable

NWS

UNSKED

unscheduled

GEN

UNSTBL

unstable

NWS

UNSTDY

unsteady

NWS

UNSTL

unsettle

NWS

UNTC

unable to establish contact

ATC

UNUSBL

unusable

GEN

UP

unknown precipitation

METAR

UPDFTS

up drafts

NWS

UPDT

update

NWS

UPR

upper

NWS

UPSLP

upslope

NWS

UPSTRM

upstream

NWS

UQOT

unquote

GEN

URAUZ

you are authorized

GEN

URG

urgent

GEN

URIZR

your recommendation is requested

GEN

USA

U.S. Army

GEN

USAF

U.S. Air Force

GEN

USAFIB

U.S. Army Aviation Flight Information

GEN

USBL

usable

GEN

USCG

U.S. Coast Guard

GEN

USMC

U.S. Marine Corps

GEN

USN

U.S. Navy

GEN

USNO

United States Naval Observatory

ATC

USNOF

United States NOTAM Office

GEN

USNS

United States NOTAM System

GEN

USP

urgent special observation (weather reports only)

NWS

UTA

upper control area

ICAO

UTC

Coordinated Universal Time

GEN

UTCOK

Coordinated Universal Time Coordinate Check Completed

GEN

UUA

urgent PIREP

ATC

UVV

upward vertical velocity

NWS

UW

upwind

ATC

UWNDS

upper winds

NWS

 

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