{"data":{"id":"us/40-cfr-appendix-a-to-subpart-e-of-part-1068","jurisdiction":"us","citation":"40 CFR Appendix A to Subpart E of Part 1068","heading":"Appendix A to Subpart E of Part 1068—Plans for Selective Enforcement Auditing","body":"The following tables describe sampling plans for selective enforcement audits, as described in § 1068.420:\nTable A-1—Sampling Plan Code Letter\nProjected family sales Code letter 1 Minimum number of tests Maximum number of tests\nTo pass To fail\n20-50 AA 3 5 20\n20-99 A 4 6 30\n100-299 B 5 6 40\n300-499 C 5 6 50\n500 + D 5 6 60\n1 A manufacturer may optionally use either the sampling plan for code letter “AA” or sampling plan for code letter “A” for Selective Enforcement Audits of families with annual sales between 20 and 50 engines/equipment. Additionally, the manufacturer may switch between these plans during the audit.\nTable A-2—Sampling Plans for Different Engine Family Sales Volumes\nStage a AA A B C D\nPass # Fail # Pass # Fail # Pass # Fail # Pass # Fail # Pass #\n1\n2\n3 0\n4 0 0\n5 1 5 0 0 0 0\n6 1 6 1 6 1 6 0 6 0 6\n7 2 6 1 7 1 7 1 7 1 7\n8 2 7 2 7 2 7 2 7 2 8\n9 3 7 2 8 2 8 2 8 2 8\n10 3 8 3 8 3 8 3 9 3 9\n11 4 8 3 8 3 9 3 9 3 9\n12 4 9 4 9 4 9 4 10 4 10\n13 5 9 5 10 4 10 4 10 4 10\n14 5 10 5 10 5 10 5 11 5 11\n15 6 10 6 11 5 11 5 11 5 11\n16 6 10 6 11 6 12 6 12 6 12\n17 7 10 7 12 6 12 6 12 6 12\n18 8 10 7 12 7 13 7 13 7 13\n19 8 10 8 13 8 13 7 13 7 13\n20 9 10 8 13 8 14 8 14 8 14\n21 9 14 9 14 8 14 8 14\n22 10 14 9 15 9 15 9 15\n23 10 15 10 15 10 15 9 15\n24 11 15 10 16 10 16 10 16\n25 11 16 11 16 11 16 11 16\n26 12 16 11 17 11 17 11 17\n27 12 17 12 17 12 17 12 17\n28 13 17 12 18 12 18 12 18\n29 14 17 13 18 13 18 13 19\n30 16 17 13 19 13 19 13 19\n31 14 19 14 19 14 20\n32 14 20 14 20 14 20\n33 15 20 15 20 15 21\n34 16 21 15 21 15 21\n35 16 21 16 21 16 22\n36 17 22 16 22 16 22\n37 17 22 17 22 17 23\n38 18 22 18 23 17 23\n39 18 22 18 23 18 24\n40 21 22 19 24 18 24\n41 19 24 19 25\n42 20 25 19 26\n43 20 25 20 26\n44 21 26 21 27\n45 21 27 21 27\n46 22 27 22 28\n47 22 27 22 28\n48 23 27 23 29\n49 23 27 23 29\n50 26 27 24 30\n51 24 30\n52 25 31\n53 25 31\n54 26 32\n55 26 32\n56 27 33\n57 27 33\n58 28 33\n59 28 33\n60 32 33\na Stage refers to the cumulative number of engines/equipment tested.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1068—GENERAL COMPLIANCE PROVISIONS FOR HIGHWAY, STATIONARY, AND NONROAD PROGRAMS","Subpart E—Selective Enforcement Auditing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"2b8c1973ec9efb59f38a2d755f8d74f0967907c165ef6a85fba2a4a0e37a88eb","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1068.455","next":"us/40-cfr-1068.501"},"notice":"GroundRules: Original legal text. Not legal advice."}