Section 1085a, Pub. L. 93–406, title I, § 306, as added Pub. L. 99–272, title XI, § 11015(a)(1)(A)(ii), Apr. 7, 1986, 100 Stat. 264; amended Pub. L. 100–203, title IX, § 9306(e)(2), Dec. 22, 1987, 101 Stat. 1330–355; Pub. L. 101–239, title VII, § 7891(a)(1), Dec. 19, 1989, 103 Stat. 2445, related to security for waivers of minimum funding standard and extensions of amortization period. 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.