Airworthiness Directives; Saab Model SAAB SF340A Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A series airplanes, that requires replacing certain power wires with a modification harness; and testing the new harness installation. These actions are necessary to prevent a momentary loss of data on the left-hand electronic flight instrumentation system (LH EFIS) screens, which could lead to the pilot's loss of situational awareness during initial climb or approach/ landing, and possibly result in reduced control of the airplane. This action is intended to address the identified unsafe condition.