40 CFR — Protection of Environment
Appendix II to Part 1039—Steady-State Duty Cycles
United States · 40 CFR — Protection of Environment · Status: effective
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- Citation
- 40 CFR — Protection of Environment, Appendix II to Part 1039—Steady-State Duty Cycles, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/195152
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Full text
(a) The following duty cycles apply for constant-speed engines:
(1) The following duty cycle applies for discrete-mode testing:
(2) The following duty cycle applies for ramped-modal testing:
(b) The following duty cycles apply for variable-speed engines with maximum engine power below 19 kW:
(1) The following duty cycle applies for discrete-mode testing:
(2) The following duty cycle applies for ramped-modal testing:
(c) The following duty cycles apply for variable-speed engines with maximum engine power at or above 19 kW:
(1) The following duty cycle applies for discrete-mode testing:
(2) The following duty cycle applies for ramped-modal testing:
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.