Summary
We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 737-400, -500, -600, -700, -700C, -800, and -900 series airplanes. This proposed AD would require an inspection to determine the part and serial numbers of the windshield wiper motors for the pilot's and first officer's windshields, and the applicable corrective action. This proposed AD results from two reports that the left and right windshield wipers stopped working in flight. We are proposing this AD to prevent failure of the windshield wipers in wet weather, which could result in decreased visibility for the flightcrew.