Summary
We propose to adopt a new airworthiness directive (AD) for certain Dassault Aviation Model MYSTERE-FALCON 50, MYSTERE-FALCON 900, and FALCON 900EX airplanes. This proposed AD was prompted by reports of cracked reinforcing straps (doublers) on the ailerons of airplanes equipped with blended winglets. This proposed AD would require repetitive detailed inspections for cracking of the upper and lower reinforcing straps on the ailerons, and replacement if necessary. We are proposing this AD to address the unsafe condition on these products.