Visibility conditions (CAt I etc.)

From:         wangermn@tucson.princeton.edu (John Paul Wangermann)
Organization: Princeton University
Date:         12 May 94 13:19:37 
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I'm interested in the use of categories of visibility conditions.

What are the definitions of Cat I, II, IIIa-c?

What must an aircraft be equipped with to operate in each of these
bands?

What equipment must an airport have to operate in these bands?

Are the present generation of HUDs certified to Cat IIc, or can landings
in this only be achieved by aircraft with full autoland capabilities?

Thanks for any info.

John Wangermann