A DC10 CARGO LINER ON CLBOUT DECLARED AN EMER AND RETURNED TO DEP ARPT DUE TO LOSS OF #1 ENG FAN COWLING. CAUSE UNDER INVESTIGATION.

Narrative

IMMEDIATELY AFTER TKOF; LCL CTLR INFORMED US THAT PART OF THE #1 ENG COVER FELL OFF THE ACFT. ONLY COCKPIT INDICATION WAS A 'ZERO' EGT READING ON THE #1 ENG. WE ELECTED TO REMAIN IN THE LCL PATTERN AND RETURN TO LAND. WE DUMPED APPROX 40000 LBS OF FUEL TO GET TO LNDG WT; RUNNING THE FUEL DUMP CHKLIST. WE RECEIVED RADAR VECTORS FOR A VISUAL APCH TO THE RWY. AFTER A NORMAL LNDG AND ROLLOUT; WE CLRED THE RWY AND SHUT DOWN THE #1 ENG AS A PRECAUTION. CRASH; FIRE; AND RESCUE DEPT MET THE ACFT ON TXWY R TO INSPECT FOR DAMAGE. CRASH; FIRE; AND RESCUE CONFIRMED PART OF THE ENG HAD DEPARTED THE ACFT; BUT NO FIRE. WE TAXIED TO THE GATE AND SHUT DOWN UNEVENTFULLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS A DC10 CARGO LINER AND JUST AFTER LIFTOFF THE TWR ALERTED THE CREW THAT A PART OF #1 ENG FELL OFF. THE RPTR SAID THE ONLY INDICATION OF SOMETHING WRONG WITH #1 ENG WAS THE INDICATOR WENT TO ZERO. THE RPTR SAID AN EMER WAS DECLARED; FUEL WAS DUMPED AND A RETURN TO THE FIELD WAS MADE IMMEDIATELY. THE RPTR STATED THAT ON THE GND IT WAS DISCOVERED THE #1 ENG INBOARD FAN COWLING WAS MISSING. THE RPTR SAID ONE LEADING EDGE SLAT AND THE INBOARD AILERON HAD INCURRED DAMAGE. THE RPTR SAID ON THE PREFLT WALKAROUND INSPECTION ALL COWLING LATCHES ON #1 AND #3 ENGS APPEARED LATCHED. THE RPTR STATED NO DETERMINATION HAS BEEN MADE ON THE CAUSE OF THE COWLING DEPARTING THE ACFT.