Common sense
Thanks Mono, I am a great believer in common sense. And certainly common sense tells us that 330ft/sec must be the vertical speed limit. I have been arguing this point with some people who say it is the horizontal speed. They point out that while 200 knots is well within the speed of a typical commercial plane, it is substantially above the speed of a normal approach, where the radalt would be used. So they are not convinced. You don't happen to have a handy reference I could quote?