AD 2019-11-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Main slat track assemblies that are affected by hydrogen embrittlement have reduced strength. This condition, if not addressed, could result in failure of main slat track assemblies, which could cause the slat to depart and potentially strike the airplane, resulting in injury to airplane occupants and/or preventing continued safe flight and landing.
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Required Actions
A maintenance records check to determine if any main slat track assembly has been removed, an inspection of the main slat track assemblies for a suspect lot number or a lot number that cannot be determined, and applicable on-condition actions. On-condition actions include replacing main slat track assemblies having a suspect lot number, or having a lot number that cannot be determined, with serviceable main slat track assemblies; shipping main slat track assemblies with suspect lot numbers or with lot numbers that cannot be determined to Boeing; and contacting Boeing to report if any main slat track assembly has been removed.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 737-700C, -800, and -900ER series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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