Flight Controls — Inboard-Flap Susceptibility to Corrosion
- Published
- Effective
- Deadline
- Replaces
- 2020-49
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bombardier BD-700-1A10 and BD-700-1A11 aircraft must amend their approved maintenance schedules within 30 days of the directive's effective date. They must incorporate the special detailed inspection of the inboard-flap internal ribs as specified in TLMC Part 3, Chapter 5 Task Number 57-51-00-201, following the applicable TLMC manual revision or later approved updates.
Summary
Canadian Airworthiness Directive CF-2020-49R1 addresses corrosion susceptibility in the inboard flaps of Bombardier Inc. model BD-700-1A10 and BD-700-1A11 aircraft. This directive mandates enhanced inspection procedures to detect internal corrosion that could weaken flap structure and potentially lead to flap detachment. The directive applies to specific serial numbers of these aircraft models and aims to improve safety through revised maintenance schedules.
What changed
CF-2020-49R1 revises the previous AD CF-2020-49 by clarifying that the mandated inspection task (Chapter 5 Task Number 57-51-00-201) is located in Part 3 of the Time Limits/Maintenance Checks (TLMC) Manual. It also updates the maintenance schedule requirements to include this specific inspection task with reference to the latest TLMC manual revisions.
Why it matters
This directive is critical for operators and maintenance organizations to prevent undetected corrosion that could compromise flight control surfaces, specifically the inboard flaps. Ensuring compliance reduces the risk of structural failure and enhances aircraft safety. It also provides clear guidance on maintenance scheduling, helping compliance teams meet regulatory requirements efficiently.
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