Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB 2000 series airplanes, that requires performing a one-time inspection of the dropout boxes of the passenger oxygen system to detect discrepancies and determine whether the system operates properly; correcting any discrepancy found; and reworking or installing new components, if necessary. This amendment is prompted by a report indicating that the oxygen system failed to operate correctly after activation at a low cabin pressure due to the incorrect installation of the oxygen masks or oxygen generators during manufacturing. The actions specified by this AD are intended to ensure that a sufficient supply of oxygen is provided to airplane passengers in the event of rapid decompression of the airplane.