Date: 202107
Location: ZZZ.Airport, US
Aircraft: B737 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Mission: Passenger
Flight phase: Parked
Aircraft component: Main Gear Wheel
Component problem: Improperly Operated
Reporter organization: Air Carrier
Reporter function: Technician
Reporter qualification: Maintenance Airframe; Maintenance Powerplant
Human factors: Communication Breakdown
Second reporter function: Technician
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Detector: Person Maintenance
When detected: Routine Inspection
Result: General Maintenance Action
Contributing factors: Procedure; Manuals; Incorrect / Not Installed / Unavailable Part; Aircraft; Human Factors
Primary problem: Incorrect / Not Installed / Unavailable Part

Narrative: We are currently assigned to the tire shop in ZZZ by bid.  We were instructed by previous tire shop techs of the current procedures and practices.  We questioned a few of the issues of different part numbers and CMM (Component Maintenance Manual).  We were told to follow the work card and that they have already addressed the procedures with engineering and all was okay.  We then; to this day; were building both wheel assemblies as status quo.  We continued down that path calling other company for build numbers; built and shipped wheels according to their directions. We received wheels on DATE. After reviewing accompanying paper work noticed the amount of work that was performed on one of the wheel assemblies and the references.  [It was] noticed the CMM reference on paperwork was different to the reference on the work card that we follow.  Work card only calls out for CMM XX-XX-XX. We tried looking up the references for XX-XX-XY in the CMM. Unable to find reference we reached out to engineering for assistance. Proceeded to ask if we could get an ECRA (Engineering Change Request Authorization) or if work card could be modified to reflect both CMM references.  We were advised by engineering to send wheels with certain part number X back to the vendor for service. As soon as we received engineering response we immediately went to the aircraft assigned to ZZZ and physically checked for wheels that were built by X tire shop with specific MFR part number and had them replaced.  All wheels have been removed from our ZZZ fleet and serviceable ready line and will be sent back to vendor for overhaul.


Second narrative: We are currently assigned to the tire shop in ZZZ by bid.  We were instructed by previous tire shop techs of the current procedures and practices.  We questioned a few of the issues of different part numbers and CMM.  We were told to follow the work card and that they have already addressed the procedures with engineering and all was okay.  We than to this day were building both wheel assemblies as status quo.  We continued down that path calling Safran for build numbers; built and shipped wheels according to their directions.We received wheels on DATE. After reviewing accompanying paper work noticed the amount of work that was performed on one of the wheel assemblies and the references.[It was] noticed the CMM reference on paperwork was different to the reference on the work card that we follow.  Work card only calls out for CMM XX-XX-XX. We tried looking up the references for XX-XX-XY in the CMM. Unable to find reference we reached out to engineering for assistance. Proceeded to ask if we could get an ECRA or if work card could be modified to reflect both CMM references.  We were advised by engineering to send wheels with certain part number back to the vendor for service.As soon as we received engineering response we immediately went to the aircraft assigned to ZZZ and physically checked for wheels that were built by X tire shop with specific MFR part number X and had them replaced.  All wheels have been removed from our ZZZ fleet and serviceable ready line and will be sent back to vendor for overhaul.


Synopsis: Technicians reported during routine records and parts receiving inspections; it was discovered that a quantity of wheels were not overhauled and certificated correctly; requiring a fleet inspection and removal from service of the suspect wheels.