Airworthiness Directives; Beech Aircraft Corporation Models 1900, 1900C, and 1900D Airplanes

This amendment supersedes Airworthiness Directive (AD) 92-06- 09, which currently requires repetitively inspecting the engine trusses for cracks on Beech Aircraft Corporation (Beech) Model 1900 and certain Model 1900C airplanes, repairing or replacing any cracked engine truss, and installing reinforcement doublers. That AD also provides the option of installing an engine truss of improved design as terminating action for the repetitive inspections. Since issuing that AD, the Federal Aviation Administration (FAA) has received several reports of these improved design trusses cracking in Area A (as specified in the service information) of the engine truss. This action retains the currently required repetitive inspections, but shortens the repetitive inspection interval in Area A and eliminates the inspection-terminating replacement option; and also incorporates the Beech Models 1900C and 1900D airplanes that have engine trusses of this same type design installed at manufacture. The actions specified by this AD are intended to prevent failure of the engine truss assembly caused by a cracked engine truss.