This unit only has 376.6 TSO and its shelf life expires in 2027, so there is plenty of air time you can get out of this unit before it will need its next overhaul. This unit installed shortly after an overhaul in 2021 and was removed in 2022. We have since got this unit repaired so it will be accompanied with a 8130-3 dated 08/15/2023. Click the link below to see the certifications. Please send us email for a quote.