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One year after installing a #7 inboard slat outboard offset gearbox on a B767-300 aircraft during a field trip; a line mechanic was informed the gearbox he installed was not effective for the aircraft. A shop mechanic had notified their engineering department six months earlier of the gearbox part number discrepancy.
| Attributes | |
| ACN | 924125 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Leading Edge Slat |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
While working a B767-300 aircraft for a leading edge slat asymmetry problem; I was involved in replacing the #7 slat outboard offset gearbox for precautionary reasons; in conjunction with other work that involved [maintenance] checks. It has been brought to my attention the 'on' unit [gearbox] installed; was not a good part number per the illustrated parts catalog (ipc). The part was ordered and received with a valid serviceable tag with the correct company part number. The 'on' [gearbox] and 'off' [gearbox] unit both contained the basic part number with different dash numbers. The referenced ipc contained the same; i.e. Multiple; dash numbers applicable with the company part number and aircraft effectivity. It was unnoticed at the time of installation [that] the dash number [of the gearbox] installed was not present in the ipc referenced.
Original NASA ASRS Text
Title: One year after installing a #7 inboard slat outboard offset gearbox on a B767-300 aircraft during a field trip; a Line Mechanic was informed the gearbox he installed was not effective for the aircraft. A Shop Mechanic had notified their Engineering Department six months earlier of the gearbox part number discrepancy.
Narrative: While working a B767-300 aircraft for a leading edge slat asymmetry problem; I was involved in replacing the #7 slat outboard offset gearbox for precautionary reasons; in conjunction with other work that involved [maintenance] checks. It has been brought to my attention the 'ON' unit [gearbox] installed; was not a good part number per the Illustrated Parts Catalog (IPC). The part was ordered and received with a valid serviceable tag with the correct company part number. The 'ON' [gearbox] and 'OFF' [gearbox] unit both contained the basic part number with different dash numbers. The referenced IPC contained the same; i.e. multiple; dash numbers applicable with the company part number and aircraft effectivity. It was unnoticed at the time of installation [that] the dash number [of the gearbox] installed was not present in the IPC referenced.
Data retrieved from NASA's ASRS site as of April 2012 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.