crossunder. what you say makes a lot of sense. but i would tend to lean towards what 'alf' posted. when this is analysed at the 'subsequent board of enquirey' the legal definitions will be what counts. i would take adhereing to those as the first and formost rule. i.e. if the 1.3 rule makes an a/c cat b but it can be safely operated at cat a speeds....then it is still cat b because thats what the definition says. however, what redsnail says rings some loud bells for me too. i think it says somewhere that if a condition exist which will not allow you to keep to speeds...in my example...cat b then the approach must be done to cat c minima.
apologies if i have misinterpreted what you were saying and answered the wrong question!!....complicated issue