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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter C - Air Programs |
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Part 90 - Control of Emissions from Nonroad Spark-Ignition Engines at or Below 19 Kilowatts |
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Subpart B - Emission Standards and Certification Provisions |
§ 90.117 - Certification procedure - test engine selection.
Latest version.
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§ 90.117 Certification procedure - test engine selection.
(a) For Phase 1 engines, the manufacturer must select, from each engine family, a test engine that the manufacturer determines to be most likely to exceed the emission standard. For Phase 2 engines, the manufacturer must select, from each engine family, a test engine of a configuration that the manufacturer determines to be most likely to exceed the HC + NOX (NMHC + NOX) Family Emission Limit (FEL), or HC + NOX (NMHC + NOX) standard if no FEL is applicable.
(b) The test engine must be constructed to be representative of production engines.
[60 FR 34598, July 3, 1995, as amended at 64 FR 15239, Mar. 30, 1999]