(a) The prescribed acceptable quality level is 40 percent.
(b) A failed engine is one whose final test results pursuant to Sec. 91.509(b), for HC+NOX. exceed the applicable family emission level.
(c) The manufacturer must test engines comprising the test sample until a pass decision is reached for HC+NOX or a fail decision is reached for HC+NOX. A pass decision is reached when the cumulative number of failed engines, as defined in paragraph (b) of this section, for HC+NOX is less than or equal to the pass decision number, as defined in paragraph (d) of this section, appropriate to the cumulative number of engines tested. A fail decision is reached when the cumulative number of failed engines for HC+NOX is greater than or equal to the fail decision number, as defined in paragraph (d) of this section, appropriate to the cumulative number of engines tested.
(d) The pass and fail decision numbers associated with the cumulative number of engines tested are determined by using the tables in Appendix A to this subpart, ``Sampling Plans for Selective Enforcement Auditing of Marine Engines,'' appropriate to the projected sales as made by the manufacturer in its report to EPA under Sec. 91.504(c)(1). In the tables in Appendix A to this subpart, sampling plan ``stage'' refers to the cumulative number of engines tested. Once a pass or fail decision has been made for HC+NOX. the number of engines with final test results exceeding the emission standard for HC+NOX shall not be considered any further for the purposes of the audit.
(e) Passing or failing of an SEA occurs when the decision is made on the last engine required to make a decision under paragraph (c) of this section.
(f) The Administrator may terminate testing earlier than required in paragraph (c) of this section.
Sec. Appendix A to Subpart G of Part 91--Sampling Plans for Selective
Enforcement Auditing of Marine Engines
Table 1--Sampling Plan Code Letter------------------------------------------------------------------------
Annual engine family sales Code letter------------------------------------------------------------------------20-50....................................... AA \1\20-99....................................... A \1\100-299..................................... B300-499..................................... C500 or greater.............................. D------------------------------------------------------------------------\1\ 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 engine families with annual sales between 20 and
50 engines. Additional, the manufacturers may switch between these
plans during the audit.
Table 2--Sampling Plan for Code Letter ``AA''
[Sample inspection criteria]------------------------------------------------------------------------
Stage Pass No. Fail No. Stage Pass No. Fail No.------------------------------------------------------------------------
1 (\1\) (\2\) 11 4 8
2 (\1\) (\2\) 12 4 9
3 0 (\2\) 13 5 9
4 0 (\2\) 14 5 10
5 1 5 15 6 10
6 1 6 16 6 10
7 2 6 17 7 10
8 2 7 18 8 10
9 3 7 19 8 10
10 3 8 20 9 10------------------------------------------------------------------------\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 ``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 4--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 5--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 6--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. [61 FR 52102, Oct. 4, 1996, as amended at 67 FR 68340, Nov. 8, 2002]