Yes, idg - all types 1-IV
OK I've been forced to dig out the Ops Manual - probably a good time for a bit of 'revision' anyway!
Firstly, for 'Stu', here is one (UK) company's definition
"A suspension of numerous minute water droplets which freezes
upon impact with ground or other exposed objects, generally
reducing the horizontal visibility at the earth's surface to less
than 1 km."
Secondly, FF hold-over times vary from 'difficult to get airborne' to 'easy', depending on the temperature/mix/de-icing facility. I guess you have to play it as you see it (as usual)
