EASA AD CF-2019-38: Electrical Power — Ram Air Turbine Deployment Actuator Galling | RegNotify

Airworthiness DirectiveEASA AD CF-2019-38

Electrical Power — Ram Air Turbine Deployment Actuator Galling

Published: Nov 7, 2019
Effective: Nov 13, 2019
Deadline: Nov 13, 2022

Bombardier BD-700 1A10 1A11

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

What to do

Operators of Bombardier BD-700-1A10 and BD-700-1A11 aircraft must check maintenance records or inspect the RAT Deployment Actuator within 36 months of the directive's effective date. If the actuator's serial number is listed as affected, it must be removed and replaced following the applicable Bombardier Service Bulletin instructions. Installation of affected actuators is prohibited from the effective date onward.

Summary

Canadian Airworthiness Directive CF-2019-38 addresses an issue with the Ram Air Turbine (RAT) Deployment Actuator on Bombardier BD-700-1A10 and BD-700-1A11 aircraft. The directive targets actuators with part number BZ02001-01 that may have an incorrectly applied anti-fretting coating, potentially causing galling and failure to deploy the RAT. This failure could compromise the aircraft's ability to power essential systems during total power loss.

What changed

This new Airworthiness Directive mandates a records check or inspection to identify affected RAT Deployment Actuators, followed by mandatory removal and replacement of any units with problematic serial numbers. It also prohibits installation of affected actuators on the specified Bombardier aircraft models. The directive references specific Bombardier Service Bulletins for compliance procedures.

Why it matters

For operators and maintenance organizations, compliance with CF-2019-38 is critical to ensure the RAT can deploy reliably in emergency situations, maintaining essential electrical power. Failure to address this issue could lead to actuator seizure and loss of backup power, posing safety risks. The directive helps maintain airworthiness and regulatory compliance under Canadian Aviation Regulations.

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