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A B737-500 new aileron bus cable broke shortly after being installed. Cable had been mis-routed around a pulley guide.
| Attributes | |
| ACN | 755320 |
| Time | |
| Date | 200709 |
| 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 | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 2 maintenance technician : 28 |
| ASRS Report | 755320 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : repair performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Brought to my attention that I had signed off the aileron cable installation on aircraft XXX. I don't remember the exact date but I remember inspecting the cable routing after installation per work card XXX; beginning at step 'M' through the end of the card. The cable routing was inspected before tension and after the cable were tensioned during operations check. The routing appeared to be correct at the time. Evidence dictates that I did not see the cable routed over the guide pin rather than under it. The area where the guide is located is rather difficult to inspect as it is located on the side of the quadrant next to aircraft structure. On a personal note; to be more (diligent) during inspection of system and components. There were no abnormal contributing factors.
Original NASA ASRS Text
Title: A B737-500 NEW AILERON BUS CABLE BROKE SHORTLY AFTER BEING INSTALLED. CABLE HAD BEEN MIS-ROUTED AROUND A PULLEY GUIDE.
Narrative: BROUGHT TO MY ATTN THAT I HAD SIGNED OFF THE AILERON CABLE INSTALLATION ON ACFT XXX. I DON'T REMEMBER THE EXACT DATE BUT I REMEMBER INSPECTING THE CABLE ROUTING AFTER INSTALLATION PER WORK CARD XXX; BEGINNING AT STEP 'M' THROUGH THE END OF THE CARD. THE CABLE ROUTING WAS INSPECTED BEFORE TENSION AND AFTER THE CABLE WERE TENSIONED DURING OPS CHK. THE ROUTING APPEARED TO BE CORRECT AT THE TIME. EVIDENCE DICTATES THAT I DID NOT SEE THE CABLE ROUTED OVER THE GUIDE PIN RATHER THAN UNDER IT. THE AREA WHERE THE GUIDE IS LOCATED IS RATHER DIFFICULT TO INSPECT AS IT IS LOCATED ON THE SIDE OF THE QUADRANT NEXT TO ACFT STRUCTURE. ON A PERSONAL NOTE; TO BE MORE (DILIGENT) DURING INSPECTION OF SYS AND COMPONENTS. THERE WERE NO ABNORMAL CONTRIBUTING FACTORS.
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.