Airworthiness Directive · Amendment 39-22283 · Oxygen
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
This AD applies to all MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD was prompted by a report of an oxygen-fed ground fire event potentially caused by electrical arcing from a faulty surround light wire on the third crew member's (observer) oxygen mask. This AD was also prompted by the determination that additional inspections and a bracket trim are needed to address the unsafe condition. This AD requires an inspection for discrepancies of the observer's oxygen mask stowage box and stowage compartment, oxygen hose connections and routing, and the associated electrical harness, and corrective actions if necessary; and modifying the oxygen mask flexible lamp harness, mounting plate, and compartment panel, including rerouting the electrical harness and applying protective sealant. This AD also requires an inspection for correct installation of the flexible lamp assembly; trimming and reidentifying a bracket; and for certain airplanes, an inspection for damage of the wire harness assembly; and applicable corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.
Within 4,000 flight hours or 24 months, whichever occurs first after the effective date of this AD, do the actions in paragraphs (g)(1) and (2) of this AD:
(1) For airplanes on which the actions specified in MHI RJ Service Bulletin 601R-35-022, dated June 1, 2021; or MHI RJ Service Bulletin 601R-35-022, Revision A, dated October 12, 2021; have not been accomplished: Do the actions specified in paragraphs (g)(1)(i) and (ii) of this AD.
(i) Do a general visual inspection for discrepancies of the observer's oxygen mask stowage box and stowage compartment, the observer's mask oxygen hose connections, the hose routing, and the associated electrical harness; reroute the electrical harness and apply protective sealant in accordance with Part A. Section 2.B. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022. If any discrepancies are found, before further flight, do all applicable corrective actions, in accordance with paragraph 2.B. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022.
(ii) Modify the oxygen mask flexible lamp harness, mounting plate, and compartment panel, including rerouting the electrical harness; apply protective sealant; inspect the flexible lamp assembly for correct installation; and trim and reidentify the bracket; in accordance with Part A. Section 2.B. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022. Do all applicable flexible lamp assembly installation corrections before further flight in accordance with Part A. Section 2.B. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022.
(2) For airplanes on which the actions specified in MHI RJ Service Bulletin 601R-35-022, dated June 1, 2021; or MHI RJ Service Bulletin 601R-35-022, Revision A, dated October 12, 2021; have been accomplished: Inspect the flexible lamp assembly for correct installation; inspect the wire harness assembly for damage; and trim and reidentify the bracket in accordance with Part B. Section 2.E. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022. Do all applicable flexible lamp assembly installation corrections and damage repair before further flight in accordance with Part B. Section 2.E. of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated April 21, 2022.
