123.A disability pension payable to a contributor is a basic monthly amount consisting of:
(a) a flat benefit, calculated as provided in section 124, and
(b) 75% of the amount that is 25% of the average monthly pensionable earnings of the contributor, calculated as provided in sections 116.1 to 116.4, for the year in which the disability pension becomes payable.
1965 (1st sess.), c. 24, s. 134; 1993, c. 15, s. 44; 1997, c. 73, s. 47.