EASA SIB CE-16-27
Air Tractor AT-250, AT-300, AT-400, AT-500, AT-600 and AT-800 Series Aeroplanes - Wing Trailing Edge Flap Control System
Summary
The Special Airworthiness Information Bulletin SAIB: CE-16-27 is an FAA informational bulletin addressing a flap torque tube airworthiness concern for Air Tractor AT-250, AT-300, AT-400, AT-500, AT-600, and AT-800 series aeroplanes. It highlights inspection procedures and maintenance actions related to the trailing edge flap control system, specifically focusing on weld cracks in the flap torque tube actuator brackets. This bulletin applies to multiple Air Tractor models under Type Certificate Data Sheets A9SW, A17SW, and A19SW.
What Changed
SAIB CE-16-27 introduces awareness of a flap torque tube weld failure issue following an in-flight incident involving an AT-802A airplane. It provides inspection guidance based on Snow Engineering Co. Service Letter #347 and recommends reporting any detected cracks to Air Tractor Customer Service. This bulletin does not mandate regulatory action but serves as a precautionary advisory.
Why It Matters
This bulletin is important for aviation professionals because undetected cracks in flap torque tube welds can lead to uncommanded flap retraction, potentially affecting flight safety. Operators, maintenance technicians, and inspectors need to be vigilant in inspecting these components to prevent in-flight failures. Early detection and corrective maintenance can mitigate risks and maintain aircraft airworthiness.
What To Do
Affected operators and maintenance personnel should perform inspections of the flap torque tube welds following the procedures outlined in Snow Engineering Co. Service Letter #347. Any cracks found must be reported to Air Tractor's Customer Service Department. There are no mandatory compliance deadlines, but timely inspections are recommended to ensure safety.