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Two line mechanics report a B747-400 right wing gear door trailing edge was damaged after making contact with the right wing body gear door lock. Mechanics were checking the adjustments of the landing gear door proximity warning targets.
| Attributes | |
| ACN | 1007980 |
| Time | |
| Date | 201205 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Main Gear |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft maintenance technician (amt) and I were working on checking the adjustment of the door warning targets reference aircraft maintenance manual (M/M) 32-61-32; per paperwork we installed [landing] gear pins and body gear door lock. Due to hangar bay-3 APU run procedures; we had to stop work and push back plane out of the hangar. After that; we started the rig check of [proximity] sensor which required to close right wing gear door and check gaps and remove body gear door lock before closing of [right wing gear] door per maintenance manual (M/M) 32-00-30 201. I forgot to remove the [body gear door] lock due to distraction of moving aircraft which resulted in right wing gear door making contact with body gear door lock.
Original NASA ASRS Text
Title: Two line mechanics report a B747-400 right wing gear door trailing edge was damaged after making contact with the right wing body gear door lock. Mechanics were checking the adjustments of the landing gear door proximity warning targets.
Narrative: Aircraft Maintenance Technician (AMT) and I were working on checking the adjustment of the door warning targets reference Aircraft Maintenance Manual (M/M) 32-61-32; per paperwork we installed [landing] gear pins and body gear door lock. Due to hangar bay-3 APU run procedures; we had to stop work and push back plane out of the hangar. After that; we started the rig check of [proximity] sensor which required to close right wing gear door and check gaps and remove body gear door lock before closing of [right wing gear] door per Maintenance Manual (M/M) 32-00-30 201. I forgot to remove the [body gear door] lock due to distraction of moving aircraft which resulted in right wing gear door making contact with body gear door lock.
Data retrieved from NASA's ASRS site as of July 2013 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.