Glueball: Thanks for your input. I knew about the surface radar coverage however are you so sure that the required fire service " response time" can be guaranteed under zero visibility conditions? Considering the size of some major airports and the thought of fire vehicles charging blindly towards an aircraft in trouble - do you really claim that the required level of fire coverage is still there in say less than 75m. vis?
My contention remains: is not the legal position not governed by the level of fire cover required to be active at the time of landing rather than the mechanics of the autoland?
Surely the 75m. minimum is not there just for the taxying of the aircraft after landing?