Development and Qualification of Composite Landing Gears

Scope:

This information report provides general guidance for the design considerations, qualification in endurance, strength and fatigue of landing gear using composite components as principle structural elements. The information discussed herein includes the development and evaluation of design data considering: the potential for imbedded manufacturing defects, manufacturing process variations, the component operating environment, potential damage threats in service, rework and overhaul, and inspection processes. This AIR mainly discusses the use of thick composites for landing gear structural components. Considerations and recommendations provided in this AIR may therefore differ greatly from considerations and recommendations found in widely accepted composite design references such as CMH-17 and Advisory Circulars such as AC 20-107(B).

Rationale:

The initial document was prepared as a starting point on how to develop a primary landing gear structural component using composite materials. A revision is needed to address several areas that were either not covered in the original release or where thoughts have changed in regard to design and qualification/ certification. Areas covered in the update will be new CVID requirements and test methods, considerations regarding protective coatings, and testing of composite/ metallic structure without failure of the metallic parts.

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