There shall be a 3-member Board of Appeals appointed by the Board of Selectmen on a rotating basis of 1 member each year for a 3-year term. Each year the Board of Selectmen shall also appoint 2 associate members for 1-year terms. The Board of Appeals' duties and authority shall include, but shall not be limited to, those specified in M.G.L. ch. 41, §§ 81Z, 81 AA.