B767-300 CREW HAD THE #1 ENG EXHAUST COWL COME OPEN ON ROTATION AT JFK. COWL IMPACTED THE WING LEADING EDGE FLAPS. MAJOR DAMAGE RESULTED.

Narrative

ON ROTATION; THE EXHAUST COWL ON THE L ENG OPENED AND BENT OVER THE LEADING EDGE OF THE WING. THERE WAS STRUCTURAL DAMAGE TO THE WING AND ENG. THE CAPT WAS THE PF. TOGW WAS APPROX 347000 LBS. CLBING THROUGH 1000 FT THE CAPT SAID THE AIRPLANE FELT BENT. SHORTLY THEREAFTER THE PURSER CALLED AND SPOKE OF THE PROB WITH THE ENG. THE FO WENT BACK TO VERIFY AND FOUND A DEADHEADING B767 CAPT ON BOARD AND TOLD HIM TO TAKE A LOOK AND COME TO THE COCKPIT. AFTER DISCUSSING THE PROB; WE DECIDED TO DECLARE AN EMER; DUMP FUEL; TRY TO GET FLAPS OUT AND LAND OVERWT ON RWY 31L AT JFK. THE CAPT SPOKE TO DISPATCH (LINE MAINT) AND CHIEF PURSER AND THE PAX. WE HAD THE DEADHEADING CAPT SIT BY THE L ENG TO ANALYZE THE SIT WHEN WE WENT TO FLAPS 1 DEG. AT THAT TIME WE LOST PART OF THE EXHAUST COWL AND RECEIVED A LEADING EDGE FLAP ASYMMETRY MESSAGE ON EICAS. WE WORKED THE CHKLIST AND WERE ABLE TO GET THE TRAILING EDGE FLAPS TO 20 DEGS. WE LANDED APPROX 10000-15000 LBS OVERWT. BRAKE TEMPS WERE 9 DEGS. MAINT AND FIRE DEPT ADVISED TO SHUT DOWN L ENG. THEY INSPECTED BRAKES AND SAID A SLOW TAXI TO THE GATE WOULD BE OK.