The head of Marine Corps aviation said today the V-22 that crashed in the Arizona desert April 8 had all major systems -- engines, drive shaft and propellers -- operating normally when it went down. Lt. Gen. Fred McCorkle told reporters in Washington that while investigators have not ruled out anything, "there is no evidence at this time to indicate mechanical failure or human error." The V-22 crashed during an operational evaluation test mission, killing all 19 Marines on board...
