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A B737-300 #2 engine constant speed drive was replaced. 3 days later; generator failed with a sheared drive shaft and only 1 mount nut present.
| Attributes | |
| ACN | 650267 |
| Time | |
| Date | 200501 |
| 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 | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 650267 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : company policies non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : #2 gen fail warning other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other other |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Environmental Factor Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On jan/wed/05 I changed the #2 engine CSD because it had dropped off line. I removed the #2 generator and CSD. I then installed the CSD and the generator. I performed a leak check and operations check of both components. Everything was done per the maintenance manual. No problems were noted. On mar/tue/05 shift manager notified me that on mar/sat/05 mechanics found the #2 engine generator with a broken shaft and only 1 mount nut holding the generator on. To the best of my knowledge; all the nuts were installed on jan/wed/05 when I reinstalled the generator.
Original NASA ASRS Text
Title: A B737-300 #2 ENG CONSTANT SPEED DRIVE WAS REPLACED. 3 DAYS LATER; GENERATOR FAILED WITH A SHEARED DRIVE SHAFT AND ONLY 1 MOUNT NUT PRESENT.
Narrative: ON JAN/WED/05 I CHANGED THE #2 ENG CSD BECAUSE IT HAD DROPPED OFF LINE. I REMOVED THE #2 GENERATOR AND CSD. I THEN INSTALLED THE CSD AND THE GENERATOR. I PERFORMED A LEAK CHK AND OPS CHK OF BOTH COMPONENTS. EVERYTHING WAS DONE PER THE MAINT MANUAL. NO PROBS WERE NOTED. ON MAR/TUE/05 SHIFT MGR NOTIFIED ME THAT ON MAR/SAT/05 MECHS FOUND THE #2 ENG GENERATOR WITH A BROKEN SHAFT AND ONLY 1 MOUNT NUT HOLDING THE GENERATOR ON. TO THE BEST OF MY KNOWLEDGE; ALL THE NUTS WERE INSTALLED ON JAN/WED/05 WHEN I REINSTALLED THE GENERATOR.
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.