3.1. A teacher who becomes the executive assistant or a member of the executive staff of a minister or of any other person contemplated in section 117 of the Civil Service Act (chapter F-3.1) continues to participate in this plan if his contributions have not been reimbursed to him and if fewer than 180 days have elapsed between the date on which he ceased to be a teacher and that on which he becomes an executive assistant or a member of an executive staff.