# Proposed AD FAA-2022-0521: MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-20-03
- Products: MHI RJ Aviation ULC
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 17, 2022, 87 FR 29841
- Comments due: July 1, 2022
- Became: [AD 2022-20-03](https://openairdocs.org/ad/2022-20-03)
- Docket: FAA-2022-0521 (https://www.regulations.gov/docket/FAA-2022-0521, where comments are filed)
- Project: MCAI-2022-00273-T
- FR document: 2022-10528
- Official PDF: https://openairdocs.org/files/sha256/06/ef/06ef3a44e8d7d06e325e52c4870f0e8a3cb6a87df9b706431655b62d4472e08d (from https://www.govinfo.gov/content/pkg/FR-2022-05-17/pdf/2022-10528.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/05/17/2022-10528/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-10528-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-0521

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702); CL-600-2C11 (Regional Jet Series 550); CL-600-2D15 (Regional Jet Series 705); CL-600-2D24 (Regional Jet Series 900); and CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was prompted by laboratory tests that showed that the oxygen tubes of the crew oxygen system may be contaminated with lubricants, as a result of the manufacturing and cleaning procedures used. This proposed AD would require cleaning and flushing the crew oxygen system. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 17, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-10528, comments due Jul 1, 2022 (https://www.federalregister.gov/documents/2022/05/17/2022-10528/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)

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