Airworthiness Directives; Robinson Helicopter Company Model R-22 Series Helicopters

This amendment adopts a new airworthiness directive (AD) for the specified Robinson Helicopter Company (Robinson) Model R-22 series helicopters that have been modified in accordance with Supplemental Type Certificate (STC) No. SR09189RC. This action requires inspecting the left-hand door and right-hand door for a crack in the door assembly integral frame, and replacing the door assembly if a crack is found. This AD also requires inspecting each door assembly to determine if the weather seal set is airworthy and installed properly, inspecting each door hinge for the proper installation of a cotter pin, and thereafter, at intervals not to exceed 100 hours time-in-service (TIS), inspecting each door assembly integral frame for a crack. This amendment is prompted by one accident and one incident involving Robinson Model R-22 series helicopters. The actions specified in this AD are intended to prevent separation of a door window or door assembly from the helicopter, which could damage the tail rotor during flight and result in loss of control of the helicopter.