TORONTO, Canada — The Delta airliner that crashed while landing at Toronto in February had an alarming rate of descent seconds before touchdown, according to preliminary investigative report. The Transportation Safety Board of Canada said an on-board ground-proximity alarm showed descent at 2.6 feet per second three seconds before impact. The Board was hesitant to explain the descent rate until its investigation is further along. Possibilities include a freakish downdraft or air-wash from a plane on the same flight path ahead the Delta jet. Airspeed was within the normal 155 to 160 mph range, the report said.
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