# 40 C.F.R. § 1043.50 (2026): Approval of methods to meet Tier 1 retrofit NO X standards

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_50

## Section

- **Citation:** 40 C.F.R. § 1043.50 (2026)
- **Heading:** Approval of methods to meet Tier 1 retrofit NO X standards
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 40 CFR: Protection of Environment / Chapter I / Part 1043 / § 1043.50: § 1043.50   Approval of methods to meet Tier 1 retrofit NO X standards.

## Text

Regulation 13 of Annex VI provides for certification of Approved Methods, which are retrofit procedures that enable Pre-Tier 1 engines to meet the Tier 1 NO X standard of regulation 13 of Annex VI. Any person may request approval of such a method by submitting an application for certification of an Approve Method to the Designated Certification Officer. If we determine that your application conforms to the requirements of Regulation 13 of Annex VI, we will issue a certificate and notify IMO that your Approved Method has been certified.

## Nearby sections

- [40 C.F.R. § 1043.1 (2026) § 1043.1   Overview.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_1.md)
- [40 C.F.R. § 1043.5 (2026) § 1043.5   Effective dates.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_5.md)
- [40 C.F.R. § 1043.10 (2026) § 1043.10   Applicability.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_10.md)
- [40 C.F.R. § 1043.20 (2026) § 1043.20   Definitions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_20.md)
- [40 C.F.R. § 1043.30 (2026) § 1043.30   General obligations.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_30.md)
- [40 C.F.R. § 1043.40 (2026) § 1043.40   EIAPP certificates.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_40.md)
- [40 C.F.R. § 1043.41 (2026) § 1043.41   EIAPP certification process.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_41.md)
- [40 C.F.R. § 1043.50 (2026) § 1043.50   Approval of methods to meet Tier 1 retrofit NO X standards.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_50.md)
- [40 C.F.R. § 1043.55 (2026) § 1043.55   Applying equivalent controls instead of complying with fuel requirements.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_55.md)
- [40 C.F.R. § 1043.60 (2026) § 1043.60   Operating requirements for engines and vessels subject to this part.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_60.md)
- [40 C.F.R. § 1043.70 (2026) § 1043.70   General recordkeeping and reporting requirements.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_70.md)
- [40 C.F.R. § 1043.80 (2026) § 1043.80   Recordkeeping and reporting requirements for fuel suppliers.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_80.md)
- [40 C.F.R. § 1043.95 (2026) § 1043.95   Great Lakes provisions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_95.md)
- [40 C.F.R. § 1043.97 (2026) § 1043.97   Interim provisions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_97.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T40_P1043_S1043_50. Check the current official text before relying on it. Not legal advice.