The aircraft involved in the accident was a McDonnell Douglas DC-10-10, registered N68045, which had made its first flight in 1972. The captain was 59-year-old Charles E. Hershe, who was operating his last flight before retirement. He had been with Continental Airlines since 1946 and had logged 29,000 flight hours, including 2,911 hours on the DC-10. The first officer was 40-year-old Michael J. Provan, who had been with Continental Airlines since 1966 and had 10,000 flight hours, with 1,149 of them on the DC-10. The flight engineer was 39-year-old John K. Olsen, who had been with the airline since 1968. He was the least experienced member of the crew with 8,000 flight hours, 1,520 of them on the DC-10.
Accident
The aircraft began its take-off from Los Angeles International Airport at approximately 9:25 am. During the take-off roll, the recapping tread of the No. 2 tire on the left main landing gear separated from the tire and the resulting overload caused that tire to blow out. That in turn, imposed an overload on the No. 1 tire on the same axle, resulting in a second blowout almost immediately after the first blowout. Pieces of metal from the rims of the failed tires then damaged the No. 5 tire on the left main gear, causing it to also blow out. Although captain Hershe initiated the abort procedure at below V1 speed, it became apparent the aircraft could not stop within the confines of the runway. This was the direct result of the partial loss of braking power following the failure of the three tires on the left main gear, and also because the runway was wet. The captain steered the aircraft to go off the end of the right half of the runway in an effort "to go beside the stanchions holding the runway lights" and thus avoid a collision with the approach light stanchions, which were positioned immediately beyond the end of the runway. About beyond the end of the runway, the left main gear broke through the non-load bearing pavement, which caused it to collapse rearward. Portions of the failed gear punctured fuel tanks in the left wing, immediately starting a fuel fire on the left side. The aircraft slid to a stop approximately beyond the departure end of the runway. Because of the fire on the left side of the aircraft, all passengers evacuated on the right side. All four emergency evacuation slides on the right side of the aircraft were affected by the heat and failed at some point during the evacuation. Flight 603's flight crew and an off-duty pilot worked quickly to guide passengers to alternate exits as the slides failed, actions later commended by the National Transportation Safety Board for saving lives and reducing the number of injuries. Passengers who were still on board after the last slide failed were forced to either jump to the ground, or use a slide rope deployed from the first officer's cockpit window. Of the 186 passengers and 14 crew on board, two passengers died due to burning and smoke inhalation. Moreover, 28 passengers and three crew members were seriously injured during the evacuation. Two of the seriously injured passengers died as a result of their injuries about three months later. A large portion of the aircraft's left section was destroyed. The aircraft subsequently was written off as a hull loss. The accident represents the second fatal accident and fifth hull loss of a McDonnell Douglas DC-10.
Investigation
During its investigation, the NTSB found the No. 2 tire failed because it threw off its tread. The No. 1 tire then failed because it was overloaded and had fatigue in its ply structure. The No. 5 tire then failed, because it was hit with a piece or pieces of metal from either the No. 2 or the No. 1 wheel. The failure of that third tire on the left main gear probably contributed to the gear breaking through the non-load bearing pavement beyond the end of the runway, which in turn caused the gear to collapse and puncture the fuel tanks. Additionally, the NTSB stated: "The tires on the aircraft may have been operated in the overdeflected condition, since the average inflation pressure was less than the optimum pressure for maximum gross weight." The NTSB made recommendations to the Federal Aviation Administration, including that the FAA prohibit mounting on the same axle different models of tires which had different load-bearing characteristics and also that greater load-bearing characteristics be required in tires manufactured in the future. The NTSB also issued a series of recommendations regarding improvements to aircraft evacuation safety, including development of more durable and fire-resistant slides, and the placement of evacuation ropes at emergency exits for use in the event of slide failure.
Aftermath
After the investigation of this accident was completed, the FAA made a number of rule changes improving runway performance, including updated tire rating criteria, performance standards, and testing requirements. In addition, the FAA mandated changes to the design of evacuation slides to increase their capacity, improve fire resistance, and inflate at a quicker speed.
