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A B737-700 was released for service after a pylon structural modification. Later discovered that incorrect fasteners and washers were installed.
| Attributes | |
| ACN | 713056 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : inspection authority |
| ASRS Report | 713056 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 7 |
| ASRS Report | 713053 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 8 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : inspection performance deficiency : installation performance deficiency : scheduled maintenance performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
On each of the listed aircraft; pylon fasteners were replaced. The paperwork called out for the hardware to be used at specific locations. In each; I was the inspector buying off the installation of the fasteners. After review of the paperwork it was discovered that in certain locations we installed wrong hardware for the paperwork. In all cases the correct bolt was installed but a longer fastener was used than called out for. Also on each fastener we used incorrect part number of washers than what the paperwork called out for. In each case correct thread protrusion was obtained per the paperwork. At this time I am unsure as to why the hardware we used was installed. Not reviewing the paperwork correctly caused this event. Complete review of the paperwork and specifications called for will prevent a recurrence of this in the future.
Original NASA ASRS Text
Title: A B737-700 WAS RELEASED FOR SVC AFTER A PYLON STRUCTURAL MODIFICATION. LATER DISCOVERED THAT INCORRECT FASTENERS AND WASHERS WERE INSTALLED.
Narrative: ON EACH OF THE LISTED ACFT; PYLON FASTENERS WERE REPLACED. THE PAPERWORK CALLED OUT FOR THE HARDWARE TO BE USED AT SPECIFIC LOCATIONS. IN EACH; I WAS THE INSPECTOR BUYING OFF THE INSTALLATION OF THE FASTENERS. AFTER REVIEW OF THE PAPERWORK IT WAS DISCOVERED THAT IN CERTAIN LOCATIONS WE INSTALLED WRONG HARDWARE FOR THE PAPERWORK. IN ALL CASES THE CORRECT BOLT WAS INSTALLED BUT A LONGER FASTENER WAS USED THAN CALLED OUT FOR. ALSO ON EACH FASTENER WE USED INCORRECT PART NUMBER OF WASHERS THAN WHAT THE PAPERWORK CALLED OUT FOR. IN EACH CASE CORRECT THREAD PROTRUSION WAS OBTAINED PER THE PAPERWORK. AT THIS TIME I AM UNSURE AS TO WHY THE HARDWARE WE USED WAS INSTALLED. NOT REVIEWING THE PAPERWORK CORRECTLY CAUSED THIS EVENT. COMPLETE REVIEW OF THE PAPERWORK AND SPECS CALLED FOR WILL PREVENT A RECURRENCE OF THIS IN THE FUTURE.
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.