Stabilizers — Elevator Power Control Unit (PCU) Arm Fittings Insufficient Fillet Radius
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect maintenance records and elevator data plates to identify affected elevators and inspect PCU arm fittings for cracks or nonconforming fillet radii before accumulating 8000 flight cycles from November 1, 2019, or before 30,000 total flight cycles, whichever occurs first. Any defective fittings must be replaced before further flight. Additionally, installation of affected elevators is prohibited unless re-identified as conforming per the specified service bulletin.
Summary
Canadian Airworthiness Directive CF-2019-36 addresses issues with the elevator power control unit (PCU) arm fittings on De Havilland DHC-8-400 series aircraft, specifically models -400, -401, and -402 with serial numbers 4001 and subsequent. The directive identifies nonconforming fillet radii on certain PCU arm fittings that could lead to premature fatigue failure and potential loss of elevator control. It mandates inspections and replacements to ensure airworthiness and safety.
What changed
CF-2019-36 introduces mandatory inspections of elevator PCU arm fittings for affected DHC-8-400 series aircraft to identify cracks or undersized fillet radii. It prohibits the installation of elevators with specific part and serial numbers unless they have been re-identified as conforming. This is a new regulation addressing a previously uncorrected manufacturing issue.
Why it matters
This directive is critical for operators and maintenance organizations to prevent potential elevator control failures caused by fatigue cracks in PCU arm fittings. Compliance ensures continued safe operation of affected DHC-8-400 series aircraft and avoids the risk of elevator jams or complete loss of elevator control, which could compromise flight safety.
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- EASA AD CF-2026-38Maintenance Requirements Manual Part 2 - Airworthiness Limitation Items - AmendmentAug 17, 2026
- EASA AD CF-2026-37Time Limits / Maintenance Checks – Airworthiness Limitation Items – AmendmentAug 6, 2026
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