Incident Description
Shortly after takeoff, while the aircraft was climbing, the No. 4 engine experienced a fire. The flight crew responded by activating the engine fire extinguisher system and initiating fuel dumping procedures. They then returned to the departure airport for an emergency landing.
Emergency Response
Upon landing, the aircraft stopped on the runway. Airport crash fire rescue (CFR) personnel arrived and extinguished both the No. 4 engine fire and a grass fire that had ignited in the runway touchdown zone. The crew then initiated an emergency evacuation, which was conducted from the left side of the aircraft.
Evacuation
During the evacuation, the L5 emergency door and its associated slide failed to deploy, hindering egress from that location. Despite this, the evacuation proceeded from the left side without further reported issues.
Examination
Post-incident examination of the No. 4 engine revealed evidence of a fuel leak originating from the main fuel control unit. The specific cause of the fire was not stated in the source.