The members of the charter board of a city elected under the provisions of this article whose draft of a charter is approved by the qualified voters of the city shall hold office for a term of six years following the approval of such charter. Any vacancy occurring during that period shall be filled temporarily by appointment by majority action of the remaining members, and a successor shall be elected at the next regular municipal election in the same manner as elective city officers, such successor to hold office for the remainder of the term.
During such six-year period as aforesaid, the board shall make a continuing study of the functioning of the city government and may, by a two-thirds vote of its members, not less than four years after such charter shall have taken effect, require the submission to the qualified voters of the city of the question of whether the charter shall be revised as a whole, such submission to be in accordance with the pertinent provisions of article four of this chapter. In the event revision as a whole is voted pursuant to such submission, the board as then constituted shall proceed to prepare a revision of the charter as a whole and the process of revision as a whole as so initiated shall be the same as that for the framing and adoption of a charter under the pertinent provisions of said article four of this chapter. During such six-year period as aforesaid, by a two-thirds vote of its members, at any time not less than one year after such charter shall have taken effect, the board may require the submission of one or more proposed charter amendments to the qualified voters of the city, in accordance with the pertinent provisions of article four of this chapter.