Section 76.33-1 - Application(a) Where a smoke detection system is installed, the provisions of this subpart, with the exception of § 76.33-90 , apply to all installations contracted for on or after November 19, 1952, and prior to July 22, 2021. Installations contracted for prior to November 19, 1952, must meet the requirements of § 76.33-90 of this subpart.(b) Vessels must comply with the requirements of § 76.33-20(c) of this subpart not later than July 22, 2021.USCG-2012-0196, 81 FR 48259 , July 22, 2016