Section 149.336 - What are the requirements for lifejackets?(a) Except as provided in paragraph (b) of this section, each unmanned deepwater port must have at least one lifejacket complying with § 149.316 of this part for each person on the deepwater port. The lifejackets need to be available for use on the deepwater port only when persons are onboard.(b) During helicopter visits, personnel who have aircraft type of lifejackets may use them as an alternative to the requirements of paragraph (a) of this section.USCG-1998-3884, 71 FR 57651 , Sept. 29, 2006, as amended by USCG-2013-0397, 78 FR 39179 , July 1, 2013