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A B737-700 wing pylon fastener modification was accomplished improperly. Incorrect or unapproved fasteners were used. Conflicting 57 page procedure direct cause of incorrect or unapproved fastener selection.
| Attributes | |
| ACN | 713741 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : inspection authority |
| ASRS Report | 713741 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : work cards contributing factor : engineering procedure performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | Pylon Attach Fastner Mod |
Narrative:
Conflicting maintenance/engineering instructions all combined in a 57 page procedure. Front cover states original problem to be not enough washers on fasteners and possible fuel leaks. The first page states the use of standard practice srm (structural repair manual) references for fasteners. The required list of fasteners from boeing even states that substitute fasteners may be supplied in boeing kits if part number are not available at time of kit build-up. The fasteners/washers/bolts that were installed passed the grip length inspection of the original problem with no fuel leaks noted.
Original NASA ASRS Text
Title: A B737-700 WING PYLON FASTENER MODIFICATION WAS ACCOMPLISHED IMPROPERLY. INCORRECT OR UNAPPROVED FASTENERS WERE USED. CONFLICTING 57 PAGE PROC DIRECT CAUSE OF INCORRECT OR UNAPPROVED FASTENER SELECTION.
Narrative: CONFLICTING MAINT/ENGINEERING INSTRUCTIONS ALL COMBINED IN A 57 PAGE PROC. FRONT COVER STATES ORIGINAL PROB TO BE NOT ENOUGH WASHERS ON FASTENERS AND POSSIBLE FUEL LEAKS. THE FIRST PAGE STATES THE USE OF STANDARD PRACTICE SRM (STRUCTURAL REPAIR MANUAL) REFS FOR FASTENERS. THE REQUIRED LIST OF FASTENERS FROM BOEING EVEN STATES THAT SUBSTITUTE FASTENERS MAY BE SUPPLIED IN BOEING KITS IF PART NUMBER ARE NOT AVAILABLE AT TIME OF KIT BUILD-UP. THE FASTENERS/WASHERS/BOLTS THAT WERE INSTALLED PASSED THE GRIP LENGTH INSPECTION OF THE ORIGINAL PROB WITH NO FUEL LEAKS NOTED.
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.