UNUSBL

AcronymDefinition
UNUSBLUnusable
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References in periodicals archive ?
Regarding LEB it says, "VOR POR TION UNUSBL 095-115 BYD 30 NM BLO 7000 FT." Translation: VOR portion unusable radials 095 through 115 beyond 30 nm below 7000 feet.
If the disruption is documented and allowable, you may see a NOTAM such as: LLZ UNUSBL BYD 20 DEG RT OF CRS.