This document contains the minimum set of technical airworthiness requirements intended for the airworthiness certification of fixed-wing Light UAS with a maximum take-off weight not greater than 150 kg and an impact energy1 greater than 66 J (49 ft-lb) that intend to regularly operate in non-segregated airspace. The lower limit is established according to available blunt trauma studies showing that below this level it is reasonably expected that a fatal injury should not occur if the UA strikes an unprotected person. It is recognized that 66 J is a conservative value based on current research that will be reviewed after further investigation. For UAS below the 66J impact energy threshold@ it is reasonable that a number of requirements can be relaxed. Specific airworthiness requirements must be agreed with the Certifying Authority on a case-by-case basis. Annex J of this document provides applicable guidelines@ that is not limited to fixed wing aspects.