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A B737-500 had 2 dents on the left wing leading edge evaluated as ok for service. Later check of srm chart finds error in technician's calculations. 1 dent was out of limits.
| Attributes | |
| ACN | 674957 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 0001 To 0600 |
| 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 | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : preflight |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 674957 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 3 |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Environmental Factor Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On oct/sat/05; pilot asked maintenance to have dents on leading edge looked at. I checked 2 dents on l-hand wing leading edge and recorded both dent dimensions on a non routine card. I checked allowable dent limits in srm and found them to be within limits; no further action was required by my calculations. On oct/thu/05; I learned by a co-worker that I had made an error in my calculations. One of the dents were just out of srm limits and required re-work.
Original NASA ASRS Text
Title: A B737-500 HAD 2 DENTS ON THE L WING LEADING EDGE EVALUATED AS OK FOR SVC. LATER CHK OF SRM CHART FINDS ERROR IN TECHNICIAN'S CALCULATIONS. 1 DENT WAS OUT OF LIMITS.
Narrative: ON OCT/SAT/05; PLT ASKED MAINT TO HAVE DENTS ON LEADING EDGE LOOKED AT. I CHKED 2 DENTS ON L-HAND WING LEADING EDGE AND RECORDED BOTH DENT DIMENSIONS ON A NON ROUTINE CARD. I CHKED ALLOWABLE DENT LIMITS IN SRM AND FOUND THEM TO BE WITHIN LIMITS; NO FURTHER ACTION WAS REQUIRED BY MY CALCULATIONS. ON OCT/THU/05; I LEARNED BY A CO-WORKER THAT I HAD MADE AN ERROR IN MY CALCULATIONS. ONE OF THE DENTS WERE JUST OUT OF SRM LIMITS AND REQUIRED RE-WORK.
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.