Airworthiness Directive Proposal for Air Tractor AT-400, AT-500, and AT-800 Series Airplanes

Summary

The Federal Aviation Administration proposes to update the safe life for Air Tractor AT-400, AT-500, and AT-800 series airplanes, requiring eddy-current inspections of the wing lower spar cap before replacement or modification to detect and correct cracks, and further reducing the safe life for certain models with Marburger Enterprises winglets.