I wouldn't use the imperative "must". It's down to your SOPs. My company specifies for visual approaches and the visual part of any non precision approaches.
Not heard that switching the FDs off changes the Flare Law, but that's not to say it doesn't happen. For instance, the rate of change of Rad Alt readings changes Flare Law, if the rate of change increases or decreases rapidly, then the feel is different - apparently. It's not mentioned in the books except for a paragraph which alludes to it in the FCOM bulletins.
It certainly makes for a good excuse for a cruncher at some of our trickier destinations!
Last edited by Dan Winterland; 8th April 2010 at 03:44.
Reason: Spelling