<< >> NASA ASRS Report 523967, August 2001

A B727-200 was dispatched in non compliance with #1 engine fan incorrect fan bearing installed. Bearing effectivity not for this engine.

Attributes
ACN	523967
Time
Date	200108
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-200
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 : 15
ASRS Report	523967
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

I was assigned to a first stage fan change at the midpoint of the job. The fan was ready for installation. Inspection had asked that the #1 bearing be replaced due to suspected wear. The previous mechanics had ordered the bearing and it was delivered during their shift. After installing the fan and case per routine card deck, the bearing was installed at this point. The rii inspector, another mechanic and myself, checked the bearing against the parts tag to ensure serviceability and matching serial number and part number data. Being that I was supplied a new bearing with a serviceable tag by another amt, I did not back track his efforts by researching the ipm to check for correct effectivity and so the wrong part was installed. The bearing shop discovered the discrepancy and the aircraft was grounded until the engine was reworked and the correct bearing installed. These parts that are so closely identical need to have effectivity tags installed or have a better way of identing usage.

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Original NASA ASRS Text

Title: A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITH #1 ENG FAN INCORRECT FAN BEARING INSTALLED. BEARING EFFECTIVITY NOT FOR THIS ENG.

Narrative: I WAS ASSIGNED TO A FIRST STAGE FAN CHANGE AT THE MIDPOINT OF THE JOB. THE FAN WAS READY FOR INSTALLATION. INSPECTION HAD ASKED THAT THE #1 BEARING BE REPLACED DUE TO SUSPECTED WEAR. THE PREVIOUS MECHS HAD ORDERED THE BEARING AND IT WAS DELIVERED DURING THEIR SHIFT. AFTER INSTALLING THE FAN AND CASE PER ROUTINE CARD DECK, THE BEARING WAS INSTALLED AT THIS POINT. THE RII INSPECTOR, ANOTHER MECH AND MYSELF, CHKED THE BEARING AGAINST THE PARTS TAG TO ENSURE SERVICEABILITY AND MATCHING SERIAL NUMBER AND PART NUMBER DATA. BEING THAT I WAS SUPPLIED A NEW BEARING WITH A SERVICEABLE TAG BY ANOTHER AMT, I DID NOT BACK TRACK HIS EFFORTS BY RESEARCHING THE IPM TO CHK FOR CORRECT EFFECTIVITY AND SO THE WRONG PART WAS INSTALLED. THE BEARING SHOP DISCOVERED THE DISCREPANCY AND THE ACFT WAS GNDED UNTIL THE ENG WAS REWORKED AND THE CORRECT BEARING INSTALLED. THESE PARTS THAT ARE SO CLOSELY IDENTICAL NEED TO HAVE EFFECTIVITY TAGS INSTALLED OR HAVE A BETTER WAY OF IDENTING USAGE.

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.