Paragraph 7
Every lifejacket the buoyancy of which depends on inflation, which may be carried for use by members of the crew shall comply with the requirements of paragraph 3 of this Part of this Schedule and in addition shall comply with the following requirements:—
it shall have two separate buoyancy compartments in either of the following forms:—
one compartment of inherent buoyancy equal to at least 9 kilogrammes and one air compartment of at least 6 kilogrammes; or
two separate air compartments each of at least 9 kilogrammes buoyancy;
it shall be marked indelibly on both sides in letters not less than 25 millimetres in size the words “CREW ONLY” and on one side only with the maker's name or other identification mark in smaller letters; and
it shall be capable of being inflated both mechanically and by mouth.