Airworthiness DirectiveEASA AD CF-2023-34

Time Limits / Maintenance Checks — Introduction of Certification Maintenance Requirement Task

Published: May 30, 2023
Effective: Jun 8, 2023
Deadline: Aug 7, 2023

Bombardier BD-100 1A10

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What to do

Affected operators must incorporate the specified new and revised CMR tasks into the appropriate chapter of the TLMC manual Part 2 within 60 days from the effective date of June 8, 2023. They must perform these tasks at the defined thresholds and intervals as outlined in the directive. Compliance with superseding Temporary Revisions or later approved TLMC revisions also satisfies the directive's requirements.

Summary

Canadian Airworthiness Directive CF-2023-34 introduces new and revised Certification Maintenance Requirement (CMR) tasks for Bombardier Inc. model BD-100-1A10 aeroplanes, including Challenger 300 and Challenger 350 variants. The directive mandates updates to the Time Limits/Maintenance Check (TLMC) manual Part 2 concerning the restoration and overhaul of the Horizontal Stabilizer Trim-Actuator (HSTA) with specific part numbers C47100-003, C47100-004, and C47100-005. This directive ensures continued airworthiness by addressing potential failures in the HSTA and motor brake assembly.

What changed

This directive introduces a new CMR task 27-40-00-108 for inspection of the Horizontal Stabilizer Trim-Actuator and revises existing tasks 27-40-00-104 and 27-41-05-104 to include flight cycle and flight hour limitations. These changes update the TLMC manual Part 2 with specific thresholds and intervals for maintenance tasks related to the HSTA. Compliance with these updated tasks is now mandatory for the affected Bombardier BD-100-1A10 aircraft.

Why it matters

The directive is critical for aviation professionals as it helps detect and prevent failures or degradation of the Horizontal Stabilizer Trim-Actuator and motor brake assembly, which could lead to loss of aircraft control. Operators, maintenance organizations, and compliance teams must incorporate these new maintenance requirements to ensure safety and regulatory compliance. Failure to comply could result in undetected component issues and increased risk during flight operations.

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