Two tire shop mechanics were informed that four B747-400 main tire/wheel assemblies that were built-up in their shop; were found with incorrect wheel bearings installed on the inboard side.

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Attributes
ACN	1026042
Time
Date	201207
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Main Gear Wheel
Person 1
Function	Technician
Qualification	Maintenance Airframe
Person 2
Function	Technician
Qualification	Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

I was notified july 2012; that bearings were incorrectly installed on (4) B747-400 main tire/wheel assemblies; inboard side. Four; B747-400 main tires were built in july 2012. Two have been located and brought to the shop and two remain out in the system. The one tire assembly that I worked on has not been verified with wrong bearing; but all four were built on the same day.

Original NASA ASRS Text

Title: Two tire shop mechanics were informed that four B747-400 main tire/wheel assemblies that were built-up in their shop; were found with incorrect wheel bearings installed on the inboard side.

Narrative: I was notified July 2012; that bearings were incorrectly installed on (4) B747-400 main tire/wheel assemblies; inboard side. Four; B747-400 main tires were built in July 2012. Two have been located and brought to the Shop and two remain out in the system. The one tire assembly that I worked on has not been verified with wrong bearing; but all four were built on the same day.

Data retrieved from NASA's ASRS site as of July 2013 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.