Airworthiness directives › 2026-05-05
AD 2026-05-05 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 identified in paragraphs (c)(1) through (6) of this AD, certificated in any category. (1) Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. (2) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes. (3) Model CL-600-2C11 (Regional Jet Series 550) airplanes. (4) Model CL-600-2D15 (Regional Jet Series 705) airplanes. (5) Model CL-600-2D24 (Regional Jet Series 900) airplanes. (6) Model CL-600-2E25 (Regional Jet Series 1000) airplanes.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Transport Canada AD CF-2025-70, dated December 22, 2025 (Transport Canada AD CF-2025-70).
Unsafe condition
This 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 AD was also prompted by additional PCU disconnect findings that show the task intervals must be reduced to allow earlier detection of potential single PCU disconnect cases. The FAA is issuing this AD to address fractured PCU rod ends. This condition, if not addressed, could lead to a disconnect between the PCU and the elevator or rudder control surface, resulting in potential loss of the control surface function or inadequate flutter suppression.
Affected ADs
This AD replaces AD 2023-23-02, Amendment 39-22604 (88 FR 86574, December 14, 2023) (AD 2023-23-02).
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