<< >> NASA ASRS Report 514886, June 2001

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.

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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.