Summary
This document proposes to supersede Airworthiness Directive (AD) 2001-20-14, which currently requires you to replace the brake shuttle valves with parts of improved design and install a shield over the hydraulic lines on certain Fairchild Aircraft SA226 and SA227 series airplanes. AD 2001-20-14 also requires you to replace the rubber fuel hose with a metal device for certain SA226 series airplanes. AD 2001-20-14 resulted from a report of a wheel brake system malfunction caused by a faulty brake shuttle valve. The FAA incorrectly referenced Model SA226-T(A) airplanes and inadvertently omitted certain serial numbers of Model SA227-AC airplanes from AD 2001-20-14. This proposed AD would retain the actions of AD 2001-20-14, correct the reference of Model SA226-T(A) airplanes, and would add additional Model SA227-AC airplanes to the Applicability section of the AD. The actions specified by this proposed AD are intended to correct potential brake shuttle valve problems, which couldcause the brake assembly to drag and overheat. Hydraulic or fuel line damage could then occur if the overheated brake assembly is retracted into the main wheel well with a consequent fire if the hydraulic or fuel lines ruptured.