Section 136.202 - Certificate of Inspection phase-in period(a) All owners or managing operators of more than one existing towing vessel required to have a COI by this subchapter must ensure that each existing towing vessel under their ownership or control is issued a valid COI according to the following schedule:(1) By July 22, 2019, at least 25 percent of the towing vessels must have valid COIs on board;(2) By July 20, 2020, at least 50 percent of the towing vessels must have valid COIs on board;(3) By July 19, 2021, at least 75 percent of the towing vessels must have valid COIs on board; and(4) By July 19, 2022, 100 percent of the towing vessels must have valid COIs on board.(b) All owners or managing operators of only one existing towing vessel required to have a COI by this subchapter must ensure the vessel has an onboard, valid COI by July 20, 2020.(c) A new towing vessel must obtain a COI before it enters into service.