EASA AD CF-2019-42: Flight Controls — Rudder Control System — Rudder Feel Unit Shaft Fracture | RegNotify

Airworthiness DirectiveEASA AD CF-2019-42

Flight Controls — Rudder Control System — Rudder Feel Unit Shaft Fracture

Published: Nov 18, 2019
Effective: Nov 22, 2019
Deadline: Nov 22, 2019

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Bombardier aircraft must replace the rudder primary feel unit shaft according to the specified flight cycle-based schedule before reaching defined flight cycle thresholds. Installation of the old shaft as a replacement is prohibited from the effective date. Compliance must be achieved by the deadlines outlined, which vary depending on the aircraft's accumulated flight cycles as of 22 November 2019.

Summary

Canadian Airworthiness Directive CF-2019-42 addresses a safety issue in Bombardier Inc. aeroplanes including models CL-600-2B19, CL-600-2C10, CL-600-2D15, CL-600-2D24, and CL-600-2C11. The directive concerns the rudder control system, specifically the rudder feel unit shaft, which has been found to fracture due to fatigue. This fracture could lead to loss of rudder feel and affect aircraft controllability.

What changed

CF-2019-42 introduces a mandatory replacement of the rudder primary feel unit shaft part number 600-90251-1 with a new shaft made from a different material. The directive prohibits installation of the old shaft as a replacement part on the affected Bombardier models. It also establishes a compliance schedule based on accumulated flight cycles for completing the replacement.

Why it matters

This directive is critical for maintaining safe flight control and ensuring the rudder system's reliability. Operators and maintenance organizations must address the fatigue fracture risk to prevent potential loss of yaw axis control. Compliance ensures continued airworthiness and adherence to Canadian Aviation Regulations.

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