Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-400, - 500, -600, -700, and -800 series airplanes. This proposal would require modification of the wiring to the windshield wiper motors in the flight compartment and nose wheel well areas. For certain airplanes, this proposal also provides for optional replacement of the windshield wiper motor/converters in the flight compartment. This action is necessary to prevent a reduction in flight crew visibility due to stalled wiper motors during heavy precipitation and a period of substantial crew workload, which could result in damage to the airplane structure and injury to flight crew, passengers, or ground personnel during final approach for landing. This action is intended to address the identified unsafe condition.