5. If the chairman is absent, indisposed or unable to act, he is replaced by the vice-chairman or, if the latter is absent, indisposed or unable to act, by a member designated in accordance with the by-laws of the board.
If a member is absent, indisposed or unable to act, the Government may appoint a substitute.
1975, c. 72, s. 5; 1978, c. 83, s. 2.