Section 1085b, Pub. L. 93–406, title I, §307, as added Pub. L. 100–203, title IX, §9341(b)(2), Dec. 22, 1987, 101 Stat. 1330–370; amended Pub. L. 101–239, title VII, §7881(i)(1)(B)–(3)(A), (4)(B), Dec. 19, 1989, 103 Stat. 2442, related to security required upon adoption of plan amendment resulting in significant underfunding.

Section 1086, Pub. L. 93–406, title I, §308, formerly §306, Sept. 2, 1974, 88 Stat. 874, renumbered §307, Pub. L. 99–272, title XI, §11015(a)(1)(A)(i), Apr. 7, 1986, 100 Stat. 264; renumbered §308, Pub. L. 100–203, title IX, §9341(b)(1), Dec. 22, 1987, 101 Stat. 1330–370; amended Pub. L. 101–239, title VII, §7894(h)(3), Dec. 19, 1989, 103 Stat. 2451, related to effective dates of part.