Aviation abbreviation
UM
- ATC
unable to maintain
UM stands for “unable to maintain” (ATC usage). Got a NOTAM full of contractions? Paste it into the decoder.
Source: FAA Order JO 7340.2 Contractions. Not for operational use.
Aviation abbreviation
unable to maintain
UM stands for “unable to maintain” (ATC usage). Got a NOTAM full of contractions? Paste it into the decoder.
Source: FAA Order JO 7340.2 Contractions. Not for operational use.