Summary
We propose to adopt a new airworthiness directive (AD) for certain Textron Aviation Inc. Models 510, 680, and 680A airplanes equipped with certain part number brake assemblies. This proposed AD was prompted by a report that brake pad wear indicator pins were set incorrectly, which could lead to brake pad wear beyond the acceptable limits without indication. This proposed AD would require inspection of the brake pad wear indicator pins and replacement of the brake assembly if any pin is set incorrectly. We are proposing this AD to address the unsafe condition on these products.