AD 2003-20-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-400 | Airworthiness Directives; Boeing Model 737-400, -500, -600, -700, and -800 Series Airplanes |
Unsafe Condition
Inadequate backlash or clearance between the gears inside the wiper motor's converter causes large internal losses due to friction between the gears, leading to stalled wiper motors during heavy precipitation and high crew workload, which could reduce flight crew visibility and potentially result in damage to the airplane structure and injury to personnel.
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Required Actions
Operators must either modify the wiring to the windshield wiper motors in the flight compartment or replace the windshield wiper motor/converters with new motor/converters. The replacement must be done in accordance with Boeing Service Bulletin 737-30-1055, Revision 1, dated March 6, 2003.
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Compliance Time
Within 36 months of the effective date (November 13, 2003)
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Affected Aircraft
Boeing Model 737-400, -500, -600, -700, and -800 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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