Summary
We propose to supersede airworthiness directive (AD) 2012-14- 11 for Arrow Falcon Exporters, Inc. (AFE), Rotorcraft Development Corporation (RDC), and San Joaquin Helicopters (SJH) Model OH-58A, OH- 58A+, and OH-58C helicopters. AD 2012-14-11 currently requires inspecting the main rotor mast (mast) for a crack. Since we issued AD 2012-14-11, we have determined that the area of the mast requiring inspection should be expanded and repetitive inspections of the mast should be accomplished. This proposed AD would expand the area of the mast that requires an inspection for a crack and would require repetitive inspections of the mast. The proposed actions are intended to prevent failure of the mast and subsequent loss of control of the helicopter.