Fire Protection – Main Wheel Well Bin Sensing Element – Incompatible Connector Nut - Replacement
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected BD-500-1A10 and BD-500-1A11 aircraft must replace the incompatible connector nuts on both sides of the main wheel well bin sensing elements. This replacement must be completed within 9350 flight hours or 56 months from the effective date of 18 June 2026, whichever occurs first, following the instructions in ACLP Service Bulletin BD500-538016 or its approved revisions.
Summary
Canadian Airworthiness Directive CF-2026-24 addresses a fire protection issue related to the main wheel well bin sensing element on Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft. The directive mandates the replacement of incompatible connector nuts that have shown corrosion, which could compromise the fire detection system. This AD applies to specific serial numbers of these aircraft models.
What changed
This new Airworthiness Directive introduces a mandatory replacement of the connector nuts on both left-hand and right-hand side main wheel well bin sensing elements. It requires compliance with the procedures outlined in ACLP Service Bulletin BD500-538016 to correct the corrosion issue found on the connector nuts.
Why it matters
The corrosion on the connector nuts can degrade the electrical and structural integrity of the main wheel well overheat detection system, potentially leading to failure of the fire detection system. For operators and maintenance organizations, addressing this issue is critical to maintaining aircraft safety and regulatory compliance, preventing possible fire-related structural damage.
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