Airworthiness Directives; Raytheon Aircraft Company Models 1900, 1900C, and 1900D Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Raytheon Aircraft Company (RAC) Models 1900, 1900C, and 1900D airplanes. This AD requires you to repetitively inspect the forward, vertical, and aft flanges of both the left and right wing rear spar lower caps for cracks, repair any cracks found, and report the inspection results to RAC. This AD results from additional fatigue cracks found in this area since inspections were performed to comply with Emergency AD 2006-18-51, which required immediate visual inspections of this area. We are issuing this AD for the purpose of performing a more rigorous inspection requiring cleaning and paint stripping of this section of the wing rear spar to detect and correct cracking in the wing spar lower caps of the affected airplanes before the cracks lead to failure. These wing rear spar cracks may result in wing failure which could result in the wing separating from the airplane with consequent loss of control.