Flight Controls – Elevator Power Control Unit Bracket Cracking
Superseded. A newer version replaces this document.
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the elevator PCU brackets and elevator spars between 7,500 total hours and before accumulating an additional 8,000 hours after 31 December 2018. Any cracked brackets must be replaced before further flight, and any spar cracks must be repaired per Bombardier-approved instructions. Inspection findings must be reported to Bombardier within 30 days of inspection completion.
Summary
Canadian Airworthiness Directive CF-2018-34 mandates inspections for elevator power control unit (PCU) bracket cracking on Bombardier DHC-8-400 series aircraft, specifically models -400, -401, and -402 with serial numbers 4001 through 4580. The directive addresses structural integrity concerns related to the elevator PCU brackets and elevator spars to prevent potential loss of pitch control. It requires a one-time inspection and reporting of findings, with replacement or repair as necessary.
What changed
This directive introduces a mandatory one-time inspection of elevator PCU brackets and elevator spars for cracks, along with reporting requirements. It requires replacement of any cracked brackets with improved strength parts and approved repairs for any spar damage. The directive also establishes compliance timelines based on aircraft total hours.
Why it matters
This Airworthiness Directive is critical for operators and maintenance organizations to prevent elevator control failures that could lead to loss of pitch control. Compliance ensures continued airworthiness and safety of affected Bombardier DHC-8-400 series aircraft. It also provides clear instructions for inspection, repair, and reporting to maintain regulatory compliance.
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