Final Rule for Control of Air Pollution From Aircraft and Aircraft Engines; Emission Standards and Test Procedures

On this page:

• Rule Summary
• Rule History
• Additional Resources

Rule Summary

EPA adopted emission standards and related provisions for aircraft gas turbine engines with rated thrusts greater than 26.7 kilonewtons. These engines are used primarily on commercial passenger and freight aircraft. The requirements were previously adopted by the International Civil Aviation Organization (ICAO). Included in the rule are two new tiers of more stringent emission standards for oxides of nitrogen (NO_x). These are referred to as Tier 6 standards and Tier 8 standards. The Tier 6 standards become effective for newly-manufactured aircraft engines beginning in 2013.

• Final Rule (pdf) (610 KB, published June 18, 2012)
• Summary and Analysis of Comments (pdf) (758 KB, EPA-420-R-12-011, May 2012)

Rule History

• Proposed Rule and Related Materials

Additional Resources

• Fact Sheet: EPA Adopts NO_x Emission Standards for Aircraft Gas Turbine Engines (pdf) (138 KB, EPA-420-F-12-027, June 2012)