A mechanic reports his shop has received a large number of B747-400 main inboard wheel halves with scored hubs. The inner heat shields are coming loose and causing scoring damage to the wheel half. He has recently scrapped two inner wheel halves for excessive scoring of the hub and believes the hub could fail in flight; causing a tire to explode.

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Attributes
ACN	931427
Time
Date	201102
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 Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

The shop has received another scored hub of a B747-400 main inboard (mib) wheel half. The shop has seen a large [number] of damage wheels since november of last year due to the heat shield coming loose during flight causing a score to the hub. Contract repair vendor wheel representative mr. X has been notified in the last several weeks regarding this trend. He notified me that he will contact their brake service center regarding these findings.

Original NASA ASRS Text

Title: A Mechanic reports his Shop has received a large number of B747-400 Main Inboard wheel halves with scored hubs. The inner heat shields are coming loose and causing scoring damage to the wheel half. He has recently scrapped two inner wheel halves for excessive scoring of the hub and believes the hub could fail in flight; causing a tire to explode.

Narrative: The Shop has received another scored hub of a B747-400 Main Inboard (MIB) wheel half. The Shop has seen a large [number] of damage wheels since November of last year due to the heat shield coming loose during flight causing a score to the hub. Contract Repair Vendor Wheel Representative Mr. X has been notified in the last several weeks regarding this trend. He notified me that he will contact their Brake Service Center regarding these findings.

Data retrieved from NASA's ASRS site as of April 2012 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.