Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 40 - Protection of Environment |
Chapter I - Environmental Protection Agency |
SubChapter C - Air Programs |
Part 91 - Control of Emissions from Marine Spark-Ignition Engines |
Subpart D - Emission Test Equipment Provisions |
§ 91.309 - Engine intake air temperature measurement.
Latest version.
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§ 91.309 Engine intake air temperature measurement.
(a) Engine intake air temperature measurement must be made within 100 cm of the air-intake of the engine. The measurement location must be either in the supply system or in the air stream entering the engine.
(b) The temperature measurements must be accurate to within ±2 °C.