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Title 40

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Displaying title 40, up to date as of 6/15/2026. Title 40 was last amended 6/15/2026.
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  1. Title 40 —Protection of Environment
  2. Chapter I —Environmental Protection Agency
  3. Subchapter C —Air Programs
  4. Part 86 —Control of Emissions from New and In-Use Highway Vehicles and Engines
  5. Appendix XI to Part 86
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eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

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Editorial Note on Part 86

Editorial Note:

Nomenclature changes to part 86 appear at 60 FR 34377, June 30, 1995 and 69 FR 18803, Apr. 9, 2004.

Appendix XI to Part 86—Sampling Plans for Selective Enforcement Auditing of Light-Duty Vehicles

40% AQL

Table 1—Sampling Plan Code Letter
Annual sales of configuration Code letter
50-99 A
100-299 B
300-499 C
500 or greater D

Table 2—Sampling Plan for Code Letter “A” 40% AQL

[Sample inspection criteria]
Stage Pass No. Fail No.
1 (1) (2)
2 (1) (2)
3 (1) (2)
4 0 (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 5 10
14 5 10
15 6 11
16 6 11
17 7 12
18 7 12
19 8 13
20 8 13
21 9 14
22 10 14
23 10 15
24 11 15
25 11 16
26 12 16
27 12 17
28 13 17
29 14 17
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” 40% AQL

[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” 40% AQL

[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” 40% AQL

[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.

[49 FR 48485, Dec. 12, 1984]

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