Accident Sequence
While on approach, a fire erupted in the wheel well of a 22-year-old airplane. The fire burned through hydraulic lines, rendering the A, B, and standby hydraulic systems inoperative. The crew successfully landed the airplane using the emergency manual reversion flight control system.
Fire Origin
The airplane had recently undergone a C check. During this maintenance, the operator's mechanics failed to observe and repair an electric wire that had been chafing against a hydraulic line. On the accident flight, the energized wire arced, punctured the hydraulic line, and ignited the escaping hydraulic fluid, causing the fire.
Hydraulic System Failures
Prior to the fire, the hydraulic check valves in the backup accumulator pressure systems for the #2 thrust reverser and the inboard pair of wheel brakes had failed due to mechanical wear. These failures prevented the respective systems from operating when needed.
Runway Overrun
Because the check valves had failed, the airplane was unable to stop on the runway after landing. During the two-minute rollout, the airplane traversed 14,000 feet, overran the runway end, and collided with a concrete structure. The impact collapsed the nose gear.