Airworthiness directives › 2023-19-08
AD 2023-19-08 Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Applicability*9
This AD applies to all MHI RJ Aviation ULC (type certificate previously held by Bombardier Inc.) airplanes, certificated in any category, identified in paragraphs (c)(1) through (5) of this AD. (1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes. (2) Model CL-600-2C11 (Regional Jet Series 550) airplanes. (3) Model CL-600-2D15 (Regional Jet Series 705) airplanes. (4) Model CL-600-2D24 (Regional Jet Series 900) airplanes. (5) Model CL-600-2E25 (Regional Jet Series 1000) airplanes.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 1,000 flight hours or 6 months, whichever occurs first from the effective date of this AD, inspect the serial numbers of the high rate of discharge (HRD) and low rate of discharge (LRD) cargo fire extinguisher containers in accordance with Section 2.B. of the Accomplishment Instructions of MHIRJ Service Bulletin 670BA-26-014, dated July 28, 2022, or Revision A, dated December 23, 2022. A review of airplane maintenance or equipment records is acceptable in lieu of this inspection if the serial number of the HRD and LRD cargo fire extinguisher containers can be conclusively determined from that review. (1) If neither of the HRD or the LRD container serial numbers is listed in Section 2.B. of the Accomplishment Instructions of MHIRJ Service Bulletin 670BA-26-014, dated July 28, 2022, or Revision A, dated December 23, 2022, no further work is required by this paragraph. (2) If the serial numbers of both the HRD and LRD containers are listed in Section 2.B. of the Accomplishment Instructions of MHIRJ Service Bulletin 670BA-26-014, dated July 28, 2022, or Revision A, dated December 23, 2022: Within 4,500 flight hours from the effective date of this AD, replace the HRD and LRD cargo fire extinguisher containers in accordance with Section 2.B. of the Accomplishment Instructions of the MHIRJ Service Bulletin 670BA-26-014, dated July 28, 2022, or Revision A, dated December 23, 2022. (3) If the serial number of either the HRD or the LRD container, but not both, is listed in Section 2.B. of the Accomplishment Instructions of MHIRJ Service Bulletin 670BA-26-014, July 28, 2022, or Revision A, dated December 23, 2022: Within 8,800 flight hours from the effective date of this AD, replace the affected HRD or LRD cargo fire extinguisher container in accordance with Section 2.B. of the Accomplishment Instructions of MHIRJ Service Bulletin 670BA-26-014, dated July 28, 2022, or Revision A, dated December 23, 2022.
Unsafe condition
This AD was prompted by a manufacturing quality escape concerning the installation of the Halon metering device on certain cargo fire extinguisher containers. The FAA is issuing this AD to address an increased Halon mass flow rate through the metering device during discharge, which could reduce the duration of the Halon flow. The unsafe condition, if not addressed, when combined with a cargo fire, could lead to a reduction in the fire extinguishing and suppression capabilities of the fire protection system.
Affected ADs
None.
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