Oxygen — Third Crew Member Oxygen Mask — Introduction of Chafing Protection for Flex Hose and Rerouting of Electrical Harness
- Published
- Effective
- Deadline
- Replaces
- 2021-32
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must comply within 4000 flight hours or 24 months from 1 October 2021, whichever occurs first, by inspecting and correcting the oxygen mask stowage box, oxygen hose routing, and electrical harness per the updated service bulletin. Aircraft that have already completed earlier revisions of the service bulletin must perform the bracket modification as specified in the latest revision. All work must follow MHIRJ SB 601R-35-022 Revision B or later approved revisions.
Summary
Canadian Airworthiness Directive CF-2021-32R1 addresses safety concerns on MHI RJ Aviation ULC model CL-600-2B19 aircraft related to the third crew member oxygen mask. It mandates the introduction of chafing protection for the oxygen supply flex hose and rerouting of the electrical harness to prevent potential oxygen-fed fires in the observer's oxygen mask stowage compartment. This directive updates and supersedes the previous AD CF-2021-32.
What changed
This revision mandates the use of the updated MHIRJ Service Bulletin 601R-35-022 Revision B, which includes additional inspections of the flexible lamp assembly and wire harness, as well as a required modification to trim an aluminum bracket to prevent electrical wire fouling. It expands on the initial corrective actions by adding Part B instructions to address newly discovered issues.
Why it matters
This directive is critical for operators and maintenance organizations to prevent the risk of oxygen-fed fires caused by electrical arcing and chafing damage in the third crew member oxygen mask system. Compliance ensures continued airworthiness and safety of the affected CL-600-2B19 aircraft, reducing the risk of in-flight or ground fire incidents related to oxygen equipment.
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