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A B737-800 on landing roll the #1 engine outboard fan cowling departed the aircraft. Technician that closed cowling believes all 3 latches were locked.
| Attributes | |
| ACN | 690423 |
| Time | |
| Date | 200602 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 26 |
| ASRS Report | 690423 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was the technician who locked all 3 latches on #1 engine l-hand fan cowling. I have no doubt all 3 cowling locks were secured. My lead did a walkaround the aircraft after me and stated everything was secured. The aircraft was in the hangar for about 2 hours after I clocked out. Callback conversation with reporter revealed the following information: reporter stated during landing rollout; first flight after above noted maintenance; the outboard fan cowl departed the aircraft. The reporter stated the cowling was closed pinned at the top and the 3 lower latches were locked. The lead technician checked the latches after close-up and noted no irregularity. The latches if not locked hang out in view and are visible to anyone making a walkaround inspection. At least 6 people; terminal technicians and flight crew making walkaround inspections would have noted unlocked latches.
Original NASA ASRS Text
Title: A B737-800 ON LNDG ROLL THE #1 ENG OUTBOARD FAN COWLING DEPARTED THE ACFT. TECHNICIAN THAT CLOSED COWLING BELIEVES ALL 3 LATCHES WERE LOCKED.
Narrative: I WAS THE TECHNICIAN WHO LOCKED ALL 3 LATCHES ON #1 ENG L-HAND FAN COWLING. I HAVE NO DOUBT ALL 3 COWLING LOCKS WERE SECURED. MY LEAD DID A WALKAROUND THE ACFT AFTER ME AND STATED EVERYTHING WAS SECURED. THE ACFT WAS IN THE HANGAR FOR ABOUT 2 HRS AFTER I CLOCKED OUT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED DURING LNDG ROLLOUT; FIRST FLT AFTER ABOVE NOTED MAINT; THE OUTBOARD FAN COWL DEPARTED THE ACFT. THE RPTR STATED THE COWLING WAS CLOSED PINNED AT THE TOP AND THE 3 LOWER LATCHES WERE LOCKED. THE LEAD TECHNICIAN CHKED THE LATCHES AFTER CLOSE-UP AND NOTED NO IRREGULARITY. THE LATCHES IF NOT LOCKED HANG OUT IN VIEW AND ARE VISIBLE TO ANYONE MAKING A WALKAROUND INSPECTION. AT LEAST 6 PEOPLE; TERMINAL TECHNICIANS AND FLT CREW MAKING WALKAROUND INSPECTIONS WOULD HAVE NOTED UNLOCKED LATCHES.
Data retrieved from NASA's ASRS site as of January 2009 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.