Section 909 - Pleadings; amended and supplemental(a) A party may amend his pleading once without leave of court at any time before the period for responding to it expires, or within ten days after its service or the service of a pleading responding to it. An amended pleading which requires a responsive pleading shall be responded to within ten days after it is served, or within ten days after the expiration of the period during which the original pleading could have been responded to, which ever is later.(b) Except as provided in subdivision (a), the CPLR shall govern amended and supplemental pleadings in this court.N.Y. Uniform District Court § 909