An excessive rate of descent that would trigger Modes 1 and 2 of the
GPWS system and eventually Mode 5 as you descend below the glide slope. Actually we did it in the airplane above 10,000' as a demonstration maneuver during maintenance acceptance flights. As I recall, it was in excess of 3,500 fpm. During maintenance acceptance flights, we would extend the flaps to 40 degrees via the ...