Section 91.55-20 - Number of plans required(a) Three copies of each plan are normally required so that one can be returned to the submitter. If the submitter desires additional approved plans, a suitable number should be submitted to permit the required distribution.CGFR 65-50, 30 FR 16974, Dec. 30, 1965, as amended by CGFR 69-116, 35 FR 6861, Apr. 30, 1970