Technical Service Bulletin S19AC — 2018 BLUE BIRD ALL AMERICAN

Overview Blue Bird has determined that the exhaust muffler hanger rods may not be torqued properly. As part of this service bulletin, it is necessary to check the torque on rods to ensure they are torqued in accordance with the provided instructions. If both exhaust hanger rods torque are correct, no further action is required. In the event that one or both hanger rods are determined to be less than the required installation torque, then the torque application process shall be utilized, per the provided instructions. Blue Bird will reimburse the repair time in accordance with the information presented below. Affected Units This service bulletin includes certain 2018 through 2020 Blue Bird All American School Buses manufactured from March 2, 2017 through March 30, 2019. Additionally, this service bulletin includes certain 2018 through 2020 Blue Bird All American Non-school Buses manufactured from March 18, 2017 through February 20, 2019. A separate printout will be provided listing all buses in your territory that are affected by this service bulletin. Service Bulletin S19AC will be mailed to all owners on record. Be sure to review your list and advise of any incorrect owner names and/or addresses. Repair Parts No parts are required for this service bulletin. Time Allowance Time allowed to complete the Torque Verification (Repair A) is 0.1 hr (6 mins). Time allowed to complete the Torque Application (Repair B), if required, is 0.3hr (18 mins). Remedy to be performed, per enclosed campaign instructions.