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Technician performing a check on a CFM56 engine, turbine section, oil supply tube wear check has some confusion on the wear direction. The job card has some contradictions.
| Attributes | |
| ACN | 514886 |
| Time | |
| Date | 200106 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 1.5 |
| ASRS Report | 514886 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : work cards performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Chart Or Publication |
Narrative:
While performing job card xa-abcd there was some confusion at step 8, turbine frame -- oil supply tube wear check. In figure 95-119, item C, the wear direction seems incorrect. Even a severely worn guide bushing, if pushed in this direction, will pass the inspection criteria. The direction of wear in item C appears to contradict the other items in figure 95-119. The supply tube bushing that I inspected appeared severely worn. However, per the criteria in the job card, I returned the tube for continued service. I fear that actually, the tube may have been unsvcable. I asked the lead technician. He confirmed that per the job card, the tube was svcable.
Original NASA ASRS Text
Title: TECHNICIAN PERFORMING A CHK ON A CFM56 ENG, TURBINE SECTION, OIL SUPPLY TUBE WEAR CHK HAS SOME CONFUSION ON THE WEAR DIRECTION. THE JOB CARD HAS SOME CONTRADICTIONS.
Narrative: WHILE PERFORMING JOB CARD XA-ABCD THERE WAS SOME CONFUSION AT STEP 8, TURBINE FRAME -- OIL SUPPLY TUBE WEAR CHK. IN FIGURE 95-119, ITEM C, THE WEAR DIRECTION SEEMS INCORRECT. EVEN A SEVERELY WORN GUIDE BUSHING, IF PUSHED IN THIS DIRECTION, WILL PASS THE INSPECTION CRITERIA. THE DIRECTION OF WEAR IN ITEM C APPEARS TO CONTRADICT THE OTHER ITEMS IN FIGURE 95-119. THE SUPPLY TUBE BUSHING THAT I INSPECTED APPEARED SEVERELY WORN. HOWEVER, PER THE CRITERIA IN THE JOB CARD, I RETURNED THE TUBE FOR CONTINUED SVC. I FEAR THAT ACTUALLY, THE TUBE MAY HAVE BEEN UNSVCABLE. I ASKED THE LEAD TECHNICIAN. HE CONFIRMED THAT PER THE JOB CARD, THE TUBE WAS SVCABLE.
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.