### Question
How does the law define CLEEN aircraft and engine technology?


### Answer
Under *49 U.S.C. § 47511*, **CLEEN aircraft and engine technology** is defined as:

> continuous lower energy, emissions, and noise aircraft and engine technology

#### Citation:
  - *49 U.S.C. § 47511*
  - Heading: **SUBTITLE VII-AVIATION PROGRAMS > PART B-AIRPORT DEVELOPMENT AND NOISE > CHAPTER 475-NOISE > SUBCHAPTER I-NOISE ABATEMENT**

