GroundRules
40 CFR Appendix X to Part 86: Appendix X to Part 86—Sampling Plans for Selective Enforcement Auditing of Heavy-Duty Engines and Light-Duty Trucks
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER C—AIR PROGRAMS
- PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES
Table 1—Sampling Plan Code Letter
Annual sales Code letter
50-99 A.
100-299 B.
300-499 C.
500 or greater D.
Table 2—Sampling Plan for Code Letter “A”
[Sample inspection criteria]
Stage Pass No. Fail No. Stage Pass No. Fail No.
1 (1) (2) 16 6 11
2 (1) (2) 17 7 12
3 (1) (2) 18 7 12
4 0 (2) 19 8 13
5 0 (2) 20 8 13
6 1 6 21 9 14
7 1 7 22 10 14
8 2 7 23 10 15
9 2 8 24 11 15
10 3 8 25 11 16
11 3 8 26 12 16
12 4 9 27 12 17
13 5 10 28 13 17
14 5 10 29 14 17
15 6 11 30 16 17
1 Test sample passing not permitted at this stage.
2 Test sample failure not permitted at this stage.
Table 3—Sampling Plan for Code Letter “B”
[Sample Inspection Criteria]
Stage Pass No. Fail No.
1 (1 ) (2 )
2 (1 ) (2 )
3 (1 ) (2 )
4 (1 ) (2 )
5 0 (2 )
6 1 6
7 1 7
8 2 7
9 2 8
10 3 8
11 3 9
12 4 9
13 4 10
14 5 10
15 5 11
16 6 12
17 6 12
18 7 13
19 8 13
20 8 14
21 9 14
22 9 15
23 10 15
24 10 16
25 11 16
26 11 17
27 12 17
28 12 18
29 13 18
30 13 19
31 14 19
32 14 20
33 15 20
34 16 21
35 16 21
36 17 22
37 17 22
38 18 22
39 18 22
40 21 22
1 Test sample passing not permitted at this stage.
2 Test sample failure not permitted at this stage.
Table 4—Sampling Plan for Code Letter “C”
[Sample Inspection Criteria]
Stage Pass No. Fail No.
1 [1] [2]
2 [1] [2]
3 [1] [2]
4 [1] [2]
5 0 [2]
6 0 6
7 1 7
8 2 7
9 2 8
10 3 9
11 3 9
12 4 10
13 4 10
14 5 11
15 5 11
16 6 12
17 6 12
18 7 13
19 7 13
20 8 14
21 8 14
22 9 15
23 10 15
24 10 16
25 11 16
26 11 17
27 12 17
28 12 18
29 13 18
30 13 19
31 14 19
32 14 20
33 15 20
34 15 21
35 16 21
36 16 22
37 17 22
38 18 23
39 18 23
40 19 24
41 19 24
42 20 25
43 20 25
44 21 26
45 21 27
46 22 27
47 22 27
48 23 27
49 23 27
50 26 27
1 Test sample passing not permitted at this stage.
2 Test sample failure not permitted at this stage.
Table 5—Sampling Plan for Code Letter “D”
[Sample Inspection Criteria]
Stage Pass No. Fail No.
1 (1 ) (2 )
2 (1 ) (2 )
3 (1 ) (2 )
4 (1 ) (2 )
5 0 (2 )
6 0 6
7 1 7
8 2 8
9 2 8
10 3 9
11 3 9
12 4 10
13 4 10
14 5 11
15 5 11
16 6 12
17 6 12
18 7 13
19 7 13
20 8 14
21 8 14
22 9 15
23 9 15
24 10 16
25 11 16
26 11 17
27 12 17
28 12 18
29 13 19
30 13 19
31 14 20
32 14 20
33 15 21
34 15 21
35 16 22
36 16 22
37 17 23
38 17 23
39 18 24
40 18 24
41 19 25
42 19 26
43 20 26
44 21 27
45 21 27
46 22 28
47 22 28
48 23 29
49 23 29
50 24 30
51 24 30
52 25 31
53 25 31
54 26 32
55 26 32
56 27 33
57 27 33
58 28 33
59 28 33
60 32 33
1 Test sample passing not permitted at this stage.
2 Test sample failure not permitted at this stage.
Collected 2026-08-27T02:26:04Z. Source file · JSON