21 If the election referred to in subsection 17(1) is made in respect of any of the 2005 to 2009 plan years of a plan that does not have a surplus as at the first day of the plan year in respect of which the election is made, Part 1 continues to apply in respect of that plan, except that
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(a) Air Canada shall have an actuarial report prepared in respect of the plan as at that day;
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[...]
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(c) the solvency deficiency disclosed by the actuarial report, if any, shall be considered to have emerged as at the valuation date of the actuarial report;
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(e) except as otherwise provided in paragraph (d), sections 4, 6 to 9 and 11 to 15 cease to apply in respect of the plan on the first day of the plan year in respect of which the election is made.