Aviation abbreviation

FIRB

FIRB stands for “Flight Information Region Boundary” (General usage). Got a NOTAM full of contractions? Paste it into the decoder.

Related abbreviations

FI/PFI/TFIBIFICFICONFIDOFIFOFIFO-HFIFPFIGFILFILG

Source: FAA Order JO 7340.2 Contractions. Not for operational use.