Climb Incident
While climbing through 600 feet after takeoff, the crew heard a loud bang and the aircraft shuddered. Immediately, the number 3 engine fire warning light illuminated. The crew discharged a fire bottle. The copilot observed flames coming from the engine, and the fire warning light remained illuminated, prompting the discharge of a second fire bottle.
Return and Landing
The aircrew returned to the airport and landed without further incident. Emergency equipment was standing by, and passengers deplaned normally.
Examination Findings
An examination of the engine revealed that the 7th stage turbine assembly had failed, penetrating the right side of the engine case. The displaced 7th stage assembly also damaged the 6th and 8th stages. Fuel lines and the fire warning system were damaged as well.