Originally Posted by IO540
Bookworm, I thought it was the
met vis (not the pilot's own assessment) that mattered for the 1800m IMCR min. I am pretty sure you wrote that somewhere previously
The regulation of interest is Rule 24(3)
For the purposes of an aeroplane taking off from or approaching to land at an aerodrome within Class B, C or D airspace, the visibility, if any, communicated to the commander of an aeroplane by the appropriate air traffic control unit shall be taken to be the flight visibility for the time being.
It is part of Section V, Visual Flight Rules, and is entitled "Visual flight and reported visibility". The intention of the rule when introduced was very clear: it was to prohibit VFR arrivals and departures in visibility less than 5000 m.
An argument could be put (and I presume rustle would put it and I missed the subtlety of the class D reference
) that the rule also applies to an IMC-rated pilot flying under IFR in class D. I don't believe that that was the intention.
However, I ask you this: if the cloudbase is 300', and a pilot with an IMC rating is established on an ILS but not yet visual, how is he supposed to "make an assessment of flight visibility below cloud" to decide if he can continue below 1000'?
He has no obligation to do so. The approach ban applies only to the absolute minimum -- the IMC-rated pilot has only to go around before landing if the flight vis is below 1800 m.