A DC8-63 CARGO LINER ON TKOF ROTATION HAD #1 AND #2 ENG COWLING DEPART THE ACFT. DECLARED EMER; DUMPED FUEL AND RETURNED TO THE FIELD.

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AT ROTATION ON TKOF RWY 16L SEA; #2 ENG N2 TO ZERO; #2 GENERATOR UNPARALLEL LIGHT ON. SEVERE ROLL L STOPPED WITH MAX AILERON R. SEA TWR RPTED FOD LEFT ON RWY 16L. DUMPED FUEL FOR 6 MINS (23000 LBS); RETURNED TO UNEVENTFUL LNDG; SEA RWY 16L AFTER FOD REMOVED. POSTFLT FOUND ENG COWLING GONE ON ENGS #1 AND #2; LIGHT DAMAGE TO LEADING EDGE PORT WING AND HORIZ STABILIZER; ALL ENG COWLINGS VERIFIED CLOSED AND LOCKED PRIOR TO TKOF. FOUND MAINT OPENED ENG COWLINGS ON #1 AND #2 DURING PRIOR DAY SHIFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ON ARR AT THE ACFT THE LOGBOOK WAS CHKED AND NEEDED SOME SIGNOFFS AS WORK HAD BEEN ACCOMPLISHED ON #1 AND #2 ENGS ON DAY SHIFT. THE RPTR SAID THE FE AND 2 MECHS RIDING ON THE TRIP WERE ASKED TO LEAVE THE AIRPLANE FOR A BRIEFING IN FRONT OF THE AIRPLANE BY THE RPTR STRONGLY ADVISING A COMPLETE VISUAL CHK OF THE COWLING. THE RPTR SAID HE RETURNED TO THE COCKPIT TO ASSIST THE FO IN PREFLTING THE COCKPIT. THE RPTR STATED THE FE AND THE 2 TECHNICIANS COMPLETED THE SECOND COWLING CHK AND VERIFIED THE COWLING CLOSED AND LATCHED AND CLRED THE LOGBOOK. THE RPTR SAID ON TKOF AT ROTATION #1 AND #2 ENG COWLING DEPARTED THE ACFT DAMAGING THE WING AND L HORIZ STABILIZER. THE RPTR STATED THE AIRPLANE ROLLED L AND FULL R AILERON WAS REQUIRED. THE RPTR SAID AN EMER WAS DECLARED; FUEL DUMPED AND THE ACFT WAS RETURNED TO THE FIELD. THE RPTR SAID THE ACFT HAD L WING PUNCTURES AND DENTED AND PUNCTURED L HORIZ STABILIZER DAMAGE. THE RPTR SAID THE AIRLINE WAS TAKEN OVER RECENTLY BY A NEW ORGANIZATION AND THE NEW GROUP WORKED THE AIRPLANE ON DAY SHIFT AND HAD THE AIRPLANE RECORDS AND PAPERWORK IN THEIR LINE OFFICE. THE RPTR SAID 2 TECHNICIANS EMPLOYED BY THE PREVIOUS MGMNT WORKED THE AIRPLANE AFTER THE DAY SHIFT MECHS AND RECORDS AND PAPERWORK WERE DISCOVERED IN THEIR LINE OFFICE. THE RPTR STATED 1 SET OF RECORDS HAD A DAY SHIFT TECHNICIAN'S WRITE-UP TO RECHK THE #1 AND #2 ENG COWLING FOR BEING LATCHED AS THE TECHNICIAN HAD NO PREVIOUS EXPERIENCE ON A DC8-63 COWLING. THE RPTR STATED THE FAA HAS BEEN INVESTIGATING THIS INCIDENT AND BELIEVES THE FINDINGS WERE THE COWLING WAS NOT LATCHED ON #1 AND #2 ENGS. CALLBACK CONVERSATION WITH RPTR ACN 463656 REVEALED THE FOLLOWING INFO: THE RPTR STATED NO CAUSE OR DETAILS WERE AVAILABLE. THE RPTR SAID THE COWLING ON #1 AND #2 ENGS LOOKED LATCHED PRIOR TO TKOF.