{"nhtsa_id":11028623,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-06","date":"2026-01-20","document_id":"TSIB 26-02","mfr_campaign":null,"replaces":null,"component":"ENGINE; POWER TRAIN","mfr_system":null,"summary":"Bulletin describing the proper de-aeration for Allison EGEN Flex Hybrid coolant loops.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028623-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028623-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028623","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"NEW FLYER","model":"XDE35","year_from":2022,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"NEW FLYER","model":"XDE40","year_from":2022,"year_to":2026,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}