Flight Controls - Power Lever Module — Introduction of Operational Check of Ground Spoiler Switches
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must revise their Transport Canada approved maintenance schedules within 30 days of 2017-12-13 to include CMR Task 276000-110 as specified in the DHC-8-400 Maintenance Requirements Manual Temporary Revision ALI-0173. The initial operational check of the ground spoiler switches must be completed within 8000 flight hours from 2017-12-13. Subsequent inspections must follow the intervals defined in the approved maintenance manual revisions.
Summary
Airworthiness Directive CF-2017-35 is issued by Transport Canada and applies to Bombardier Inc. DHC-8-400, -401, and -402 aircraft, serial numbers 4001 and subsequent. It introduces a new operational check for the ground spoiler switches in the power lever module to prevent uncommanded spoiler deployment during take-off. This directive aims to enhance flight safety by addressing a known issue with faulty switches that could cause runway excursions.
What changed
This directive introduces a new Certification Maintenance Requirement (CMR) task 276000-110 for the operational check of ground spoiler switches in the power lever module. It mandates revising the approved maintenance schedule to include this task within 30 days and completing the initial check within 8000 flight hours from the effective date. Compliance with updated or superseding maintenance manual revisions also satisfies the directive's requirements.
Why it matters
The directive is critical for aviation professionals as it addresses a safety risk involving uncommanded ground spoiler deployment, which can lead to rejected take-offs and runway excursions. Operators and maintenance organizations must incorporate this check to ensure continued airworthiness and regulatory compliance. It helps prevent incidents that could compromise aircraft control during critical phases of flight.
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