This subpart implements the duty preference and related customs provisions applicable to imported and exported goods under the United States-Peru Trade Promotion Agreement (the PTPA) signed on April 12, 2006, and under the United States-Peru Trade Promotion Agreement Implementation Act (the Act; Pub. L. 110-138, 121 Stat. 1455 (19 U.S.C. 3805 note). Except as otherwise specified in this subpart, the procedures and other requirements set forth in this subpart are in addition to the customs procedures and requirements of general application contained elsewhere in this chapter. Additional provisions implementing certain aspects of the PTPA and the Act are contained in Parts 24, 162, and 163 of this chapter.