# 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 2015-07-01.

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.

• 2015-07-28; vol. 80 # 144 - Tuesday, July 28, 2015
1. 80 FR 44863 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Notice of Public Hearings and Comment Period
GPO FDSys: XML | Text
DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
Notice of public hearings; extension of comment period.
NHTSA and EPA will jointly hold a public hearing on Thursday, August 6, 2015, beginning at 9:00 a.m. local time, and a second hearing on Tuesday, August 18, 2015, beginning at 9:00 a.m. local time. EPA and NHTSA will make every effort to accommodate all speakers that arrive and register. Each hearing will continue until everyone has had a chance to speak. If you would like to present oral testimony at one of these this public hearings, please contact the person identified under FOR FURTHER INFORMATION CONTACT by August 3, 2015, for the first hearing, or by August 11, 2015, for the second hearing. In order to provide commenters 30 days after the last public hearing, the comment period for the proposal is being extended through September 17, 2015.
40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068

Title 40 published on 2015-07-01

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

• 2015-09-08; vol. 80 # 173 - Tuesday, September 8, 2015
1. 80 FR 53756 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Extension of Comment Period
GPO FDSys XML | Text
DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
Proposed rule; extension of comment period.
The comment period for the proposed rule published July 13, 2015 (80 FR 40139) is extended. Written comments for both documents must be received on or before October 1, 2015.
40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068