What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) On take-off roll a mechanic on the ground noted smoke coming from under the cowling of number 4 engine. At 650FT AGL crew heard a loud bang from the r/h side of the aircraft and the fire warning horn and light came on for number 4 engine. Crew activated the number 1 fire bottle but fire warning remained on, so they attempted to fire number 2 but the button would not depress. The warning went off as they turned to climb. Crew dumped fuel and landed without further incident. Aircraft was missing the #4 engine r/h core cowling and the fwd upper r/h side of engine showed signs fire damage.
As the FAA filed it
(-23) ON TAKE-OFF ROLL A MECHANIC ON THE GROUND NOTED SMOKE COMING FROM UNDER THE COWLING OF NUMBER 4 ENGINE. AT 650FT AGL CREW HEARD A LOUD BANG FROM THE R/H SIDE OF THE AIRCRAFT AND THE FIRE WARNING HORN AND LIGHT CAME ON FOR NUMBER 4 ENGINE. CREW ACTIVATED THE NUMBER 1 FIRE BOTTLE BUT FIRE WARNING REMAINED ON, SO THEY ATTEMPTED TO FIRE NUMBER 2 BUT THE BUTTON WOULD NOT DEPRESS. THE WARNING WENT OFF AS THEY TURNED TO CLIMB. CREW DUMPED FUEL AND LANDED WITHOUT FURTHER INCIDENT. AIRCRAFT WAS MISSING THE #4 ENGINE R/H CORE COWLING AND THE FWD UPPER R/H SIDE OF ENGINE SHOWED SIGNS FIRE DAMAGE.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.