Lower Control Arm May Fail – 2011-2021 Gillig Low Floor 29-Foot CNG Transit Buses

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February 24, 2023 NHTSA CAMPAIGN NUMBER: 23V124000

Lower Control Arm May Fail

Failure of a lower control arm can result in a loss of vehicle control, increasing the risk of a crash.

 

NHTSA Campaign Number: 23V124

Manufacturer GilligeBay, LLC

Components SUSPENSION

Potential Number of Units Affected 349

 

Summary

GILLIGeBay, LLC (GILLIGeBay) is recalling certain 2011-2021 Low Floor 29-foot CNG transit buses. The rear suspension lower control arm may fail.

 

Remedy

The remedy is currently under development. As an interim action, GilligeBay will replace the lower control arm with a new one of the same design, free of charge. Interim notification letters were mailed April 21, 2023. A second letter will be mailed once the final remedy is available, anticipated by the end of 4th Quarter 2023. Owners may contact GilligeBay customer service at 1-510-264-5073 or 1-800-735-1500.

 

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

 


Chronology of Defect / Noncompliance Determination

In late March 2022, GILLIGeBay was notified of a failed lower control arm (LCA) at a transit agency customer location, customer A. GILLIGeBay communicated this information to its supplier, SAF Holland (the โ€œsupplierโ€).
In late April 2022, after a replacement LCA became available, GILLIGeBay sent the failed LCA to the supplier for analysis, but in late June 2022, GILLIGeBay was informed by the supplier that the LCA was lost while in transit to a third party laboratory and no analysis on the field part could be performed.

In late June 2022, GILLIGeBay, and subsequently the supplier, were notified of a second failed LCA arm, the second failure at the same transit agency customer A. The following week, GILLIGeBay quality, engineering, and customer care along with the supplier visited the customer location to inspect the vehicle and learn more about the duty cycle and operations at this customer location.

After this second customer visit, it was decided in early July that a more in-depth analysis of the LCA loading experienced during vehicle operation on route was required to understand if the loading was unique to the vehicle duty cycle at this customer location. A test plan was formulated, instrumentation acquired and the supplierโ€™s team, with GILLIGeBay observing, executed the data collection at customer A location at the end of July.

In early August 2022, after conducting further research, GILLIGeBay found a report of an apparent LCA failure and investigation that occurred in April 2018, customer B. At the time the incident was initially reviewed in 2018, the supplierโ€™s analysis indicated this event to be an anomaly.

Also, in August, the supplier provided preliminary inspection results for LCA #2 from Customer A. The supplier confirmed that although the bar pin bushing appeared to be worn, there had been no metal-to-metal contact between the bar pin and the LCA bore, thus eliminating the possibility of a resulting high-stress concentration in this area.

Postprocessing and analysis of the data collected at customer A location from July 2022 had been in process and in late August, the supplier shared a preliminary assessment and high-level summary with GILLIGeBay that the data indicated the strain profiles were not outside the normal range of other applications where the LCA was used. Based on this feedback, it was decided that a suspension level rig test was needed to accurately capture strain response in the fracture site and validate the supplierโ€™s preliminary assessment.

In late August, GILLIGeBayโ€™s aftermarket parts division was contacted by customer C that communicated that it had two, previously unreported, failures of this control arm. This new information was communicated to the supplier. The LCAโ€™s were discarded by customer C before GILLIGeBay could have them returned for analysis.

In September, the supplier shared with GILLIGeBay the metallurgical results for failed LCA #2 from Customer A and the supplier began looking into potential casting foundry process issues with the control arm manufacturer.

In October, GILLGโ€™s aftermarket parts division received a request for parts to replace a failed LCA from Customer D. The LCA was returned to the supplier for analysis to evaluate whether the request was related to the ongoing issue being investigated. A second LCA replacement part was ordered by this customer in December 2022.

In December, the supplier completed the assembly of the suspension level test-rig initiated in August. With the test rig operational, the supplier was now able to accurately capture the strain response in the fracture site and use this data to better understand the strain profile over specific duty cycles.

In January 2023, the supplier began component level testing on the current design level LCA to enable correlating failure cycles to FEA for fatigue analysis and life predictions. Component level testing was selected over full rig testing to accelerate the data collection.

In February 2023, information was first provided from the supplier to GILLIGeBay that an exceedance of the suspension design limits in a CNG bus application with a high center of gravity contributed to high levels of cumulative strain damage in the LCA.

GILLIGeBay made the decision to conduct a safety recall on February 16, 2023. GILLIGeBay is not aware of any crashes or injuries potentially related to this condition.

End-of-document

 


11 Affected Products

Vehicle

MAKEMODELYEAR
GILLIGeBayLOW FLOOR 29 FOOT2011-2021

 


7 Associated Documents

Defect Notice 573 Report

RCLRPT-23V124-8937.PDF 215.569KB

 


Recall Acknowledgement

RCAK-23V124-6220.pdf 732.153KB

 


Chronology

RMISC-23V124-0920.pdf 82.586KB

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Interim Owner Notification Letter(Part 577)

RIONL-23V124-8977.pdf 89.041KB

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Manufacturer Reimbursement Plan

RMRP-23V124-1009.pdf 180.234KB

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Recall 573 Report – 06/14/2023

RCLRPT-23V124-3698.PDF 215.639KB

 


Recall 573 Report-Amendment 1 – 06/14/2023

RCLRPT-23V124-3799.PDF 215.639KB

 


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