Airworthiness Directives; British Aerospace (Jetstream) Model 4101 Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to certain British Aerospace (Jetstream) Model 4101 airplanes. This action requires repetitive detailed visual inspections to detect cracks of the shear cleats of the roller guide structural support of the passenger door, and replacement of any cracked shear cleat with a new shear cleat. This action also provides for an optional terminating modification that constitutes terminating action for the repetitive inspections. This amendment is prompted by a report indicating that fatigue cracking was found in the roller guide shear cleats of the passenger door. The actions specified in this AD are intended to detect and correct such fatigue-related cracking, which could result in structural failure of the passenger door, and consequent rapid depressurization of the airplane or loss of the passenger door while the airplane is in flight.