# Proposed AD FAA-2023-1639: MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-23-02
- Products: MHI RJ Aviation ULC
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 28, 2023, 88 FR 48767
- Comments due: September 11, 2023
- Became: [AD 2023-23-02](https://openairdocs.org/ad/2023-23-02)
- Docket: FAA-2023-1639 (https://www.regulations.gov/docket/FAA-2023-1639, where comments are filed)
- Project: MCAI-2023-00109-T
- FR document: 2023-15986
- Official PDF: https://openairdocs.org/files/sha256/fd/56/fd56f87c37b1de3f7d130e5188cd2073e18579479aacb93f048d4f9ce5beea15 (from https://www.govinfo.gov/content/pkg/FR-2023-07-28/pdf/2023-15986.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/07/28/2023-15986/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-15986-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-1639

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 & 440), 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 reports of power control unit (PCU) rod end fractures due to pitting corrosion, and a determination that new or more restrictive airworthiness limitations are necessary. This proposed AD would, for certain airplanes, require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. This proposed AD would also require accomplishing certain aircraft maintenance manual (AMM) tasks and corrective actions following short-term or long-term storage. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 28, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-15986, comments due Sep 11, 2023 (https://www.federalregister.gov/documents/2023/07/28/2023-15986/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)

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