Stabilizer Beams May Develop Cracks – 2016-2022 Pierce Ascendant 107′ Aerials & 110′ Platforms

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-407 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Pierce Manufacturing Submission Date : JUN 06, 2023 NHTSA Recall No. : 23V-407 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Pierce Manufacturing Address : 2600 American Drive P.O. BOX 2017 Appleton WI 54912-2017 Company phone : 920-832-3000 Population : Number of potentially involved : NR Estimated percentage with defect : NR Vehicle Information : Vehicle 1 : 2016-2022 Pierce Ascendant Ladder & Platform Vehicle Type : Body Style : Power Train : NR Descriptive Information : Only Pierce Ascendant 107′ Aerials and 110′ Platforms with galvanized stabilizer beams are affected. The affected population is very limited due to the galvanized stabilizer beam option being introduced approximately 1 1/2 year ago. Production Dates : SEP 21, 2016 – DEC 15, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Prior to galvanizing, the stabilizer beams on affected vehicles did not undergo a high heat stress relief process. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Without the stress relief process, the stabilizer beam weldment could allow for cracks to develop in the parent metal of the weldment. Should cracks develop and if allowed to propagate over time, the stabilizer beam may no longer provide sufficient stability when an aerial ladder or platform is elevated and may increase the risk of injury to persons on or near the ladder or platform. Description of the Cause : Upon welding up the box structure of a stabilizer beam, and prior to galvanizing, the weldment must be stress relieved by heating the weldment to a high temperature. This stress relief process was not performed on the affected trucks with galvanized stabilizer beams. Part 573 Safety Recall Report 23V-407 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : Cracks may be visible on the galvanized stabilizer beam prior to deployment of the aerial ladder or platform. Involved Components : Component Name 1 : NR Component Description : NR Component Part Number : NR Supplier Identification : Component Manufacturer Name : Oshkosh Corporation Address : 1917 Four Wheel Drive Oshkosh Wisconsin 54902 Country : United States Chronology : • In mid-May 2023 the Quebec City, Canada fire department discovered cracks on the outside edge of galvanized coated stabilizer beams during a routine vehicle inspection. • Pierce was notified and an investigation commenced. • On May 19, 2023 an internal team met and identified the lack of a stress relieving proces s following the beam weldment and before galvanizing the stabilizer beam. The stress relieving process was examined and introduced into production. • On May 31, 2023, Pierce decided to conduct a safety recall to address vehicles in the field. Description of Remedy : Description of Remedy Program : Customers will be instructed to keep their trucks in service but to NOT use the aerial ladder or platform until the remedy is completed. A combination of visual inspection and magnetic particle testing will be performed by a Pierce authorized representative . Should crack(s) be discovered on galvanized stabilizer beams, the affected beams will be replaced with those which are Electro Coated (E-Coat). Part 573 Safety Recall Report 23V-407 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 How Remedy Component Differs from Recalled Component : The remedy component will be Electro Coated (E-Coat) and not galvanized. Identify How/When Recall Condition was Corrected in Production : The stress relieving process was audited in the production environment and stabilizer beams on vehicles produced after May 2023 will have undergone the stress relief process . Recall Schedule : Description of Recall Schedule : NR Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : NR – NR * NR – Not Reported

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