Airworthiness Directives; Saab AB, Saab Aerosystems Airplanes
We are adopting a new airworthiness directive (AD) for all Saab AB, Saab Aerosystems Model 340A (SAAB/SF340A) and SAAB 340B airplanes. This AD was prompted by reports indicating that wear of the elevator pushrods has occurred on some airplanes after extended time in service. This AD requires determining if a certain part number is installed, performing a detailed inspection for individual play between the elevator pushrod assembly and degradation of elevator pushrod assembly, and replacing the affected elevator pushrod assembly with a new elevator pushrod assembly if necessary. We are issuing this AD to prevent a free elevator from affecting the pitch control authority, which may result in reduced controllability of the airplane.