Narrative:

At rotation on takeoff runway 16L sea, #2 engine N2 to zero, #2 generator unparallel light on. Severe roll left stopped with maximum aileron right. Sea tower reported FOD left on runway 16L. Dumped fuel for 6 mins (23000 pounds), returned to uneventful landing, sea runway 16L after FOD removed. Postflt found engine cowling gone on engines #1 and #2, light damage to leading edge port wing and horizontal stabilizer, all engine cowlings verified closed and locked prior to takeoff. Found maintenance opened engine cowlings on #1 and #2 during prior day shift. Callback conversation with reporter revealed the following information: the reporter stated on arrival at the aircraft the logbook was checked and needed some signoffs as work had been accomplished on #1 and #2 engines on day shift. The reporter said the flight engineer and 2 mechanics riding on the trip were asked to leave the airplane for a briefing in front of the airplane by the reporter strongly advising a complete visual check of the cowling. The reporter said he returned to the cockpit to assist the first officer in preflting the cockpit. The reporter stated the flight engineer and the 2 technicians completed the second cowling check and verified the cowling closed and latched and cleared the logbook. The reporter said on takeoff at rotation #1 and #2 engine cowling departed the aircraft damaging the wing and left horizontal stabilizer. The reporter stated the airplane rolled left and full right aileron was required. The reporter said an emergency was declared, fuel dumped and the aircraft was returned to the field. The reporter said the aircraft had left wing punctures and dented and punctured left horizontal stabilizer damage. The reporter 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 reporter said 2 technicians employed by the previous management worked the airplane after the day shift mechanics and records and paperwork were discovered in their line office. The reporter stated 1 set of records had a day shift technician's write-up to rechk the #1 and #2 engine cowling for being latched as the technician had no previous experience on a DC8-63 cowling. The reporter stated the FAA has been investigating this incident and believes the findings were the cowling was not latched on #1 and #2 engines. Callback conversation with reporter acn 463656 revealed the following information: the reporter stated no cause or details were available. The reporter said the cowling on #1 and #2 engines looked latched prior to takeoff.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.