A DC8-71F ON TKOF ROLL HAD THE L AND R FAN COWLING DEPART THE #2 ENG INCURRING DAMAGE TO THE UPPER WING SURFACE AND COWLING.

Narrative

ON 02/FRI/02 AT XA45L WHILE DEPARTING FROM ZZZ; ENG COWLINGS CAME OFF THE #2 ENG DURING TKOF. I COMPLETED A ROUTINE PREFLT WITH NO PROBS NOTED. THE #2 ENG LOCKS INDICATED CLOSED AND THE COWLINGS AROUND THE ENG APPEARED FLUSH AGAINST THE ENG. WORK HAD BEEN DONE ON THE #2 ENG HIGH STAGE BLEED VALVE EARLIER THAT DAY; TO INCLUDE AN ENG RUN ON THE ENG. THE PRIMARY REASON WE RETURNED TO LAND WAS BECAUSE OF ANOTHER PROB; THE NOSE LNDG GEAR DOOR WOULD NOT CLOSE COMPLETELY AFTER TKOF; AND GEAR RETRACTION. SHORTLY AFTER DEALING WITH THIS PROB ATC RPTED TO US ANOTHER ACR SAW SOMETHING ON THE RWY THAT APPEARED TO BE AN ENG COWLING. SO WE KEPT OUR SPD BELOW 230 KTS; THE GEAR DOOR LIMIT SPD AND RETURNED TO LAND. UPON BLOCK-IN I IMMEDIATELY LOOKED UNDER THE NOSE LNDG GEAR AREA AND THE GEAR DOOR WAS OPEN; BUT WHEN I LOOKED BACK TOWARD THE ENGS; THE COWLINGS ON #2 ENG WERE GONE. WHEN THE ARPT AUTH LOCATED THE L HALF OF THE ENG COWLING OUR CREW WENT WITH THEM ON TO THE RWY TO SEE IT. THE FORWARD AND AFT LOCKS WERE STILL LOCKED AND THE CTR LOCK WAS UNLOCKED. ON THE CFM ENGS THE LOCKS ARE VERY EASY TO IDENT IF THEY ARE UNLOCKED BECAUSE THEY WOULD HANG DOWN SO FAR BELOW THE ENG THAT YOU COULD SEE IT FROM THE NOSE; WINGTIP; OR TAIL OF THE ACFT; LET ALONE BEING RIGHT NEXT TO THE ENG. AND WHEN YOU CHK THE CSD OIL; ON THE LOWER RIGHT SIDE; THE CTR LOCK IS ABOUT 10-12 INCHES FROM THE ACCESS DOOR; SO IF THE LOCK IS OPEN YOU WOULD CLRLY SEE IT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG COWLING WAS CHKED ON THE PREFLT WALKAROUND INSPECTION AND APPEARED SECURE. THE RPTR SAID THE ENG COWLING WAS BEING CLOSED AS THE PREFLT INSPECTION WAS BEING CONDUCTED AND COMPLETED AS THE INSPECTION REACHED #2 ENG. THE RPTR STATED THE COWLING WAS FLUSH AND ALL LATCHES WERE LOCKED. THE RPTR SAID WHEN THE COWLING WAS RECOVERED FROM THE RWY THE FORWARD LATCH AND AFT LATCH WERE FOUND LOCKED BUT THE CTR LATCH WAS FOUND UNLOCKED. THE COMPANY HAS MADE NO DETERMINATION ON ANY FAILURE OR FAULT.