# 40 CFR Part 86, Appendix XIV to Part 86 - Determination of Acceptable Durability Test Schedule for Light-Duty Vehicles and Light Light-Duty Trucks Certifying to the Provisions of Part 86, Subpart R

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View PDF at GPO Pt. 86, App. XIV
Appendix XIV to Part 86—Determination of Acceptable Durability Test Schedule for Light-Duty Vehicles and Light Light-Duty Trucks Certifying to the Provisions of Part 86, Subpart R
A manufacturer may determine mileage test intervals for durability-data vehicles subject to the conditions specified in § 86.1726. The following procedure shall be used to determine if the schedule is acceptable to the Administrator:
1. Select exhaust system mileage test points and maintenance mileage test points for proposed (prop) schedule.
2. Calculate the sums of the squares corrected to the mean of the system mileages at the proposed test points:
Aprop = [∑(Xp)2 − ((∑Xp)2 / Np))prop
Where:
Xp = Individual mileages at which the vehicle will be tested.
Np = Total number of tests (including before and after maintenance tests).
(Subscript “p” refers to proposed test schedule).
3. Determine exhaust system mileage test points and maintenance mileage test points based on testing at five thousand mile intervals from 5,000 miles through the final testing point and maintenance mileage test points selected for the proposed schedule in step 1 of this appendix. This schedule will be designated as the standard (std) test schedule.
4. Calculate the sums of squares corrected to the mean of the standard schedule:
Bstd=[∑(Xs)2−((∑Xs)2/Ns))std
Where:
Xs = Individual mileages at which the vehicle will be tested.
Ns = Total number of tests (including before and after maintenance).
(Subscript “s” refers to standard test schedule).
5. Refer to table I and determine tp at (Np − 2)prop degrees of freedom and ts at (Ns − 2)std.
6. If (Aprop)1/2≥tp/ts×(Bstd)1/2 the proposed plan is acceptable.
Table I to Appendix XIV
Degrees of freedom (N-2) t
1 6.314
2 2.920
3 2.353
4 2.132
5 2.015
6 1.943
7 1.895
8 1.860
9 1.833
10 1.812
11 1.796
12 1.782
13 1.771
14 1.761
15 1.753
16 1.746
17 1.740
18 1.734
19 1.729
20 1.725
21 1.721
22 1.717
23 1.714
24 1.711
25 1.708
[62 FR 31264, June 6, 1997]

Title 40 published on 2014-07-01

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

• 2014-08-08; vol. 79 # 153 - Friday, August 8, 2014
1. 79 FR 46356 - Emergency Vehicle Rule—SCR Maintenance and Regulatory Flexibility for Nonroad Equipment
GPO FDSys XML | Text
ENVIRONMENTAL PROTECTION AGENCY
Final rule.
This rule is effective on September 8, 2014.
40 CFR Parts 86 and 1039

Title 40 published on 2014-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 86 after this date.

• 2014-08-08; vol. 79 # 153 - Friday, August 8, 2014
1. 79 FR 46356 - Emergency Vehicle Rule—SCR Maintenance and Regulatory Flexibility for Nonroad Equipment
GPO FDSys XML | Text
ENVIRONMENTAL PROTECTION AGENCY
Final rule.
This rule is effective on September 8, 2014.
40 CFR Parts 86 and 1039