Summary
We propose to adopt a new airworthiness directive (AD) for certain Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD would require inspecting to determine the clearance and any wire bundle damage between wire bundle W443 and the left forward rudder quadrant, followed by adjusting the minimum clearance between the wire bundle and the left forward rudder quadrant, and repairing any wire bundle damage. This proposed AD results from reports of contact between wire bundle W443 and the left forward rudder quadrant. We are proposing this AD to detect and correct contact between the wire bundle and the left forward rudder quadrant. Damage to the wire bundle could result in uncommanded stabilizer trim and autopilot disconnects due to shorted wires from contact between the wire bundle and the left forward rudder quadrant, potentially affecting the capability of the flight crew during high work load and consequently reducing control of the airplane. Restricted free movement of the rudder quadrant at full right rudder travel would reduce controllability of the airplane.