Section 903.21 - May the PHA amend or modify a plan?(a) A PHA, after submitting its 5-Year Plan or Annual Plan to HUD, may amend or modify any PHA policy, rule, regulation or other aspect of the plan. If the amendment or modification is a significant amendment or modification, as defined in § 903.7(r)(2) , the PHA:(1) May not adopt the amendment or modification until the PHA has duly called a meeting of its board of directors (or similar governing body) and the meeting, at which the amendment or modification is adopted, is open to the public; and(2) May not implement the amendment or modification, until notification of the amendment or modification is provided to HUD and approved by HUD in accordance with HUD's plan review procedures, as provided in § 903.23 .(b) Each significant amendment or modification to a plan submitted to HUD is subject to the requirements of §§ 903.13 , 903.15 , and 903.17 .