Airworthiness Directives; Textron Aviation Inc. Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Textron Aviation Inc., Model 408 airplanes. This AD was prompted by the manufacturer's revision of the aircraft maintenance manual (AMM) to add a detailed inspection for the horizontal stabilizer spar, and change the airplane serial effectivity for the vertical stabilizer spar detailed inspection. This AD requires revising the Airworthiness Limitations Section (ALS) of the existing AMM or instructions for continued airworthiness (ICA) and the existing approved maintenance or inspection program, as applicable. The FAA is issuing this AD to address the unsafe condition on these products.