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A B737-300 had a left elevator tab replaced due to vibration. Maintenance supervisor quarantining parts is unable to account for missing bolts and suspects bolts not replaced.
| Attributes | |
| ACN | 550331 |
| Time | |
| Date | 200208 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 550331 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure performance deficiency : logbook entry performance deficiency : installation |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
An aircraft experienced severe vibration due to a missing inboard hinge bolt on the left elevator trim tab. It was requested that the elevator and trim tab be replaced, along with other inspections and maintenance to be performed. The parts removed were to be gathered and quarantined. In the process of preparing the removed parts for shipment, I realized I did not have the 3 bolts that attached the tab to the elevator and the 2 bolts that attach the push/pull control rods to the tab. I then recalled the mechanics telling me they had ordered and replaced the missing bolt. The 3 outboard attach bolts and the bolts that secure the tab push/pull control rods may not have been replaced.
Original NASA ASRS Text
Title: A B737-300 HAD A L ELEVATOR TAB REPLACED DUE TO VIBRATION. MAINT SUPVR QUARANTINING PARTS IS UNABLE TO ACCOUNT FOR MISSING BOLTS AND SUSPECTS BOLTS NOT REPLACED.
Narrative: AN ACFT EXPERIENCED SEVERE VIBRATION DUE TO A MISSING INBOARD HINGE BOLT ON THE L ELEVATOR TRIM TAB. IT WAS REQUESTED THAT THE ELEVATOR AND TRIM TAB BE REPLACED, ALONG WITH OTHER INSPECTIONS AND MAINT TO BE PERFORMED. THE PARTS REMOVED WERE TO BE GATHERED AND QUARANTINED. IN THE PROCESS OF PREPARING THE REMOVED PARTS FOR SHIPMENT, I REALIZED I DID NOT HAVE THE 3 BOLTS THAT ATTACHED THE TAB TO THE ELEVATOR AND THE 2 BOLTS THAT ATTACH THE PUSH/PULL CTL RODS TO THE TAB. I THEN RECALLED THE MECHS TELLING ME THEY HAD ORDERED AND REPLACED THE MISSING BOLT. THE 3 OUTBOARD ATTACH BOLTS AND THE BOLTS THAT SECURE THE TAB PUSH/PULL CTL RODS MAY NOT HAVE BEEN REPLACED.
Data retrieved from NASA's ASRS site as of July 2007 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.