# Proposed AD FAA-2022-1154: MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-24-10
- Products: MHI RJ Aviation ULC
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 12, 2022, 87 FR 55735
- Comments due: October 27, 2022
- Became: [AD 2022-24-10](https://openairdocs.org/ad/2022-24-10)
- Docket: FAA-2022-1154 (https://www.regulations.gov/docket/FAA-2022-1154, where comments are filed)
- Project: MCAI-2022-00550-T
- FR document: 2022-19448
- Official PDF: https://openairdocs.org/files/sha256/b1/8b/b18b912531686cc8f357b9f7021bb0cacff641b209a803175e25e1408847589a (from https://www.govinfo.gov/content/pkg/FR-2022-09-12/pdf/2022-19448.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/09/12/2022-19448/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-19448-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-1154

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes, Model CL-600-2C11 (Regional Jet Series 550) airplanes; Model CL-600-2D15 (Regional Jet Series 705) airplanes; Model CL-600-2D24 (Regional Jet Series 900) airplanes; and Model CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was prompted by a report that the pressure switch gauge assembly for the cargo bay fire extinguisher container has the potential to display an incorrect pressure under certain environmental conditions. This proposed AD would require replacing affected high rate of discharge (HRD) and low rate of discharge (LRD) pressure switch gauge assemblies for the cargo bay fire extinguisher container. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 12, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-19448, comments due Oct 27, 2022 (https://www.federalregister.gov/documents/2022/09/12/2022-19448/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)

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