Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Raytheon Aircraft Company (Raytheon) Models 99, 99A, 99A (FACH), A99A, B99, and C99 airplanes. The proposed AD would require you to inspect all main landing gear (MLG) hydraulic actuators to determine the end cap part number that is installed, and replace any actuator that has a part number 4A125C32 end cap. The proposed AD is the result of the potential for fatigue cracks to develop on the MLG hydraulic actuator end caps. The actions specified by this proposed AD are intended to eliminate existing and prevent future fatigue cracks in the MLG hydraulic actuator end caps. Such cracks could cause hydraulic fluid to leak and result in collapse of one or more gears with consequent aircraft damage and passenger injury.