60. A senior administrator’s participation in the short-term salary insurance plan and his right to receive benefits shall end on the earliest of the following dates:(1) subject to section 44, the date on which he ceases to be subject to the provisions of this chapter;
(2) the date on which use of his sick leaves begins in order to fully compensate the work load prescribed in the progressive retirement agreement and which immediately precedes the actual retirement;
(3) the date on which his pre-retirement leave begins;
(4) the date of his retirement.