---
kind: "section"
citation: "40 C.F.R. § 1031.1"
title: "40"
number: "1031.1"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/1031.1"
---

# §1031.1. Applicability.


This part applies to aircraft gas turbine engines on and after January 1, 2023. Emission standards apply as described in [subpart B](/cfr/40/subpartB.md) of this part.

- (a) Except as provided in [paragraph (b)](#b) of this section, the regulations of this part apply to aircraft engines subject to [14 CFR part 33](/cfr/14/part33.md).
- (b) **The requirements of this part do not apply to the following aircraft engines—**
  - (1) **Reciprocating engines (including engines used in ultralight aircraft).**
  - (2) **Turboshaft engines such as those used in helicopters.**
  - (3) **Engines used only in aircraft that are not airplanes.**
  - (4) **Engines not used for propulsion.**

## Notes

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 87 FR 72351, Nov. 23, 2022, unless otherwise noted.