(1) A deputy chairperson of the TRAB assists the chairperson in the performance of the chairperson's functions.(2) If the chairperson is absent, a deputy chairperson nominated by the chairperson is to act as chairperson during that absence and, where so acting, may perform the functions and exercise the powers of the chairperson as fully and effectively as the chairperson.(3) If the office of chairperson is vacant, a deputy chairperson nominated by the Minister is to act as chairperson during the vacancy and, while so acting, may perform the functions and exercise the powers of the chairperson as fully and effectively as the chairperson.