AD 99-04-08 Amendment 39-11032

This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Models 1900, 1900C, and 1900D airplanes. This AD requires inspecting the main landing gear hydraulic actuators to determine whether a certain Frisby Aerospace actuator is installed, and reworking or replacing any of these Frisby Aerospace actuators. This AD is the result of reports of fatigue cracks in the end cap of main landing gear hydraulic actuators manufactured by Frisby Aerospace and installed on the affected airplanes. The actions specified by this AD are intended to prevent the main landing gear from failing to lock down due to the hydraulic actuator cracking and separating, which could result in loss of control of the airplane during landing, taxi, or ground operations.