If the QNH is less than 29.92, you would not be assigned FL180.
Thank you Fathom. So in effect, the yanks have the same setup as us: unusable FLs with low QNHs. Back to you, Leaddie.
Originally Posted by Leddie
firstly acquaint yourself with ICAO definitions of accidents and incidents (not Australian home -grown definitions)
Use whatever definitions you like, leddie, bent metal is bent metal.