FL972 – Insufficient Exterior Joint Strength – 2024 Thomas Built SAF-T-LINER C2 School Buses

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Defect / Noncompliance Information Report (Section 573.6) FL972 Date of Submission: 05/08/2023 Manufacturer: Daimler Truck North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: ⃝ Safety Defect X Non-Compliance Vehicle Information Model Yr. Start: 2024 Model Yr. End: 2024 Make: Thomas Built Buses Model: Saf-T-Liner C2 Production Dates: Begin: 10/01/2022 End: 02/10/2023 Descriptive Information: One particular exterior body panel joint formed at the last rafter, near the structure of the D-pillar, on certain Thomas Built Buses (TBB) Saf-T-Liner C2 school buses built on a specific TBB production shift may not meet the tensile requirements of FMVSS 221 School bus body joint strength. Basis for Determination of the Recall Population: TBB Saf-T-Liner C2 school buses manufactured on a specify production shift in the production range listed above. Number potentially involved: 146 Estimated percentage of involved with defect: 20% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain TBB Saf-T-Liner C2 school buses built on a specific TBB production shift, the rear exterior joint formed by side-sheet overlapping the D-panel at the last rafter was found to not meet the joint strength requirement of FMVSS 221 School bus body joint strength. Describe the safety risk: A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 may increase the risk of injury in a crash. Identify any warning which can precede or occur: NA If applicable, identify the manufacture of the defective or noncompliant component.: Daimler Truck North America Involved Components Component Name: ____N/A______________ Component Description: _____ N/A _____________ Component Part Number: _____ N/A _____________ Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: TBB began an additional production shift in October 2022, with a slow ramp-up of production volumes and low overall volumes relative to the other production shift. IIn February 2023, TBB noticed a possible mis-installation of side sheet panels during this additional shift. TBB promptly corrected the problem and began an investigation of vehicles that could have had their side sheet panels installed during the third shift, which (given that vehicle assembly crosses multiple shifts) rendered this task difficult. Upon determining that some vehicles did have their side sheet panels installed in this shift, and that some of those may have been improperly installed, TBB Compliance immediately began an investigation. In late April 2023, Thomas Built Buses continued working to identify potentially affected vehicles and conducting strength testing. On May 4 2023, DTNA decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses C2 school buses built on this production shift with the rear exterior at the last rafter that may not meet the joint strength requirements of FMVSS 221. There are no warranty claims, field or service reports, nor any known accidents, injuries, or deaths. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. The repair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Identify the Recall Schedule Describe the recall schedule for notifications.: Customer notification will be made by first class mail using Daimler Truck North America records to determine the customers affected. Planned Dealer Notification Begin Date: 07/07/2023 Planned Dealer Notification End Date: 07/07/2023 Planned Owner Notification Begin Date: 07/07/2023 Planned Owner Notification End Date: 07/07/2023 Does DTNA plan to file inconsequentiality petition? ⃝ Yes X No Manufacturer’s identification code for this recall (if applicable): FL972 DTNA Representative; Sam Geser Sam Geser Manager, Compliance and Regulatory Affairs

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-330 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : MAY 08, 2023 NHTSA Recall No. : 23V-330 Manufacturer Recall No. : FL972 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 146 Estimated percentage with defect : 20 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Bus SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : One particular exterior body panel joint formed at the last rafter, near the structure of the D-pillar, on certain Thomas Built Buses (TBB) Saf-T-Liner C2 school buses built on a specific TBB production shift may not meet the tensile requirements of FMVSS 221 School bus body joint strength. Production Dates : OCT 01, 2022 – FEB 10, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : On certain TBB Saf-T-Liner C2 school buses built on a specific TBB production shift, the rear exterior joint formed by side-sheet overlapping the D-panel at the last rafter was found to not meet the joint strength requirement of FMVSS 221 School bus body joint strength. FMVSS 1 : 221 – School bus body joint strength FMVSS 2 : NR Description of the Safety Risk : A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 may increase the risk of injury in a crash. Description of the Cause : NR Identification of Any Warning that can Occur : NR Part 573 Safety Recall Report 23V-330 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : NR Component Description : NR Component Part Number : NR Supplier Identification : Component Manufacturer Name : Daimler Truck North America Address : NR NR Country : NR Chronology : TBB began an additional production shift in October 2022, with a slow ramp-up of production volumes and low overall volumes relative to the other production shift. IIn February 2023, TBB noticed a possible mis-installation of side sheet panels during this additional shift. TBB promptly corrected the problem and began an investigation of vehicles that could have had their side sheet panels installed during the third shift, which (given that vehicle assembly crosses multiple shifts) rendered this task difficult. Upon determining that some vehicles did have their side sheet panels installed in this shift, and that some of those may have been improperly installed, TBB Compliance immediately began an investigation. In late April 2023, Thomas Built Buses continued working to identify potentially affected vehicles and conducting strength testing. On May 4 2023, DTNA decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses C2 school buses built on this production shift with the rear exterior at the last rafter that may not meet the joint strength requirements of FMVSS 221. There are no warranty claims, field or service reports, nor any known accidents, injuries, or deaths. Part 573 Safety Recall Report 23V-330 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. Therepair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Truck North America records to determine the customers affected. Planned Dealer Notification Date : JUL 07, 2023 – JUL 07, 2023 Planned Owner Notification Date : JUL 07, 2023 – JUL 07, 2023 * NR – Not Reported

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Defect / Noncompliance Information Report (Section 573.6) FL973 Date of Submission: 05/09/2023 Manufacturer: Daimler Truck North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: ⃝ Safety Defect X Non-Compliance Vehicle Information Model Yr. Start: 2021 Model Yr. End: 2024 Make: Thomas Built Buses Model: Saf-T-Liner C2 Production Dates: Begin: 1/24/2020 End: 04/18/2023 Descriptive Information: One particular interior body panel joint formed at the last rafter, near the structure of the D-pillar, on certain Thomas Built Buses (TBB) Saf-T-Liner C2 school buses may not meet the tensile requirements of FMVSS 221 School bus body joint strength. Basis for Determination of the Recall Population: TBB Saf-T-Liner C2 school buses manufactured within the production range listed above. Number potentially involved: 23,603 Estimated percentage of involved with defect: 100% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain TBB Saf-T-Liner C2 school buses, the rear interior joint formed by the D-panel overlapping the side-sheet at the last rafter may not meet the joint strength requirement of FMVSS 221 School bus body joint strength. Describe the safety risk: A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 may increase the risk of injury in a crash. Identify any warning which can precede or occur: NA If applicable, identify the manufacture of the defective or noncompliant component.: Daimler Truck North America. Involved Components Component Name: Side Sheet Joint Component Description: Side Sheet Joint – Interior Component Part Number: _____ _____________ Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In mid-April 2023, TBB identified a possible production mis-installation at the interior D-pillar joint where the D-panel overlaps the side-sheet at the last rafter. TBB promptly corrected production installation process and began an investigation to determine the scope and potential consequences of the issue. Later in April 2023, while Thomas Built Buses continued working to identify potential affected vehicles, Thomas Built Buses began conducting FMVSS 221 strength testing to determine if the panels, as built, would be noncompliant. In early May TBB conducted a field inspection to further assess the scope of the affected vehicles. In early May 2023, DTNA decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses C2 school buses that may not meet the joint strength requirements of FMVSS 221 at the lower D-pillar. There are no warranty claims, field or service reports, nor any known accidents, injuries, or deaths. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. The repair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Identify the Recall Schedule Describe the recall schedule for notifications.: Customer notification will be made by first class mail using Daimler Truck North America records to determine the customers affected. Planned Dealer Notification Begin Date: 07/08/2023 Planned Dealer Notification End Date: 07/08/2023 Planned Owner Notification Begin Date: 07/08/2023 Planned Owner Notification End Date: 07/08/2023 Does DTNA plan to file inconsequentiality petition? ⃝ Yes X No Manufacturer’s identification code for this recall (if applicable): FL973 DTNA Representative; Sam Geser Sam Geser Manager, Compliance and Regulatory Affairs

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-330 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : MAY 11, 2023 NHTSA Recall No. : 23V-330 Manufacturer Recall No. : FL972 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 146 Estimated percentage with defect : 20 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Bus SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : One particular exterior body panel joint formed at the last rafter, near the structure of the D-pillar, on certain Thomas Built Buses (TBB) Saf-T-Liner C2 school buses built on a specific TBB production shift maynot meet the tensile requirements of FMVSS 221 School bus body joint strength. Production Dates : OCT 01, 2022 – FEB 10, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : On certain TBB Saf-T-Liner C2 school buses built on a specific TBB production shift, the rear exterior joint formed by side-sheet overlapping the D-panel at the last rafter was found to not meet the joint strength requirement of FMVSS 221 School bus body joint strength. FMVSS 1 : 221 – School bus body joint strength FMVSS 2 : NR Description of the Safety Risk : A body Joint on a school bus that does not meet the joint strength requirement of FMVSS 221 may increase the risk of injury in a crash. Description of the Cause : NR Identification of Any Warning that can Occur : NR Part 573 Safety Recall Report 23V-330 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Side Sheet Joint Component Description : Side Sheet Joint – Exterior Component Part Number : NR Supplier Identification : Component Manufacturer Name : Daimler Truck North America Address : NR NR Country : NR Chronology : TBB began an additional production shift in October 2022, with a slow ramp-up of production volumes and low overall volumes relative to the other production shift. IIn February 2023, TBB noticed a possible misinstallation of side sheet panels during this additional shift. TBB promptly corrected the problem and began an investigation of vehicles that could have had their side sheet panels installed during the third shift, which (given that vehicle assembly crosses multiple shifts) rendered this task difficult. Upon determining that some vehicles did have their side sheet panels installed in this shift, and that some of those may have been improperly installed, TBB Compliance immediately began an investigation. In late April 2023, Thomas Built Buses continued working to identify potentially affected vehicles and conducting strength testing. On May 4 2023, DTNA decided to initiate a voluntary noncompliance recall for certain Thomas Built Buses C2 school buses built on this production shift with the rear exterior at the last rafter that may not meet the joint strength requirements of FMVSS 221. There are no warranty claims, field or service reports, nor any known accidents, injuries, or deaths. Part 573 Safety Recall Report 23V-330 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Additional mechanical fasteners will be added to the joints on affected vehicles in order to bring the vehicles into compliance. Therepair will be conducted by a Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Truck North America records to determine the customers affected. Planned Dealer Notification Date : JUL 07, 2023 – JUL 07, 2023 Planned Owner Notification Date : JUL 07, 2023 – JUL 07, 2023 * NR – Not Reported

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