When we were doing the HUD testing for the NG 737 in Mojave 3 or 4 years ago, we were specifically asked to do Flap 15 approaches and landings, to cater for the user airline's requirements for approach/climb into Denver and other high altitude airfields. Being a European operator, we only did Flap 15 landings on non-normal procedures and in Europe Flap 30 or 40 seem to be the norm. I agree that the switch referred to is operated in connection with the GPWS or EGPWS.
[ 10 October 2001: Message edited by: kriskross ]