Airworthiness Directives; British Aerospace Jetstream Model 3101 Airplanes

This action confirms the effective date of Airworthiness Directive (AD) 99-01-07, which applies to certain British Aerospace Jetstream Model 3101 airplanes. AD 99-01-07 requires installing additional stringers at the lower fuselage skin panels between the main and rear spar frames. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified in this AD are intended to correct a strength deficiency in the area of the lower fuselage skin panels between the main rear spar frames, which, if not corrected, could result in reduced or loss of control of the airplane during maximum speed limit operations.