The flight received landing clearance six miles from the runway, about 1,200 feet above the ground and about 15 knots above the bug speed of 166. Flaps were at 40 percent-the recommended setting for an engine-out approach. Shortly after, however, the pilot called for "landing flap," and the flaps came down to 100 percent. Full flaps lowered the bug speed to 146 knots and would shorten the landing roll, but also increased the drag that the three remaining engines would have to overcome. Ideally, full flaps, if used at all on an engine-out approach, would be reserved until landing was assured, not when the airplane was still miles away from the runway and, incidentally, at an unusually low altitude. Nevertheless, the C-5 was perfectly capable of landing from this position and with this flap setting, on three engines, and neither the left seat pilot nor the third pilot, who was sitting in the jumpseat behind the other two, commented on the early selection of full flaps.