AD 2020-10-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking in the center wing lower skin could cause structural failure of the wings.
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Required Actions
Perform repetitive eddy current high frequency (ETHF) inspections for any cracking in the left and right side center wing lower skin, and repair if any crack is found. Expand the inspection area to include adjacent stringers with similar stress levels and perform repetitive inspections with increased sensitivity for crack detection. Perform repetitive eddy current low frequency (ETLF) inspections of the left and right side fastener holes and the forward and aft skins at certain locations for any cracking.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) airplanes, and Model MD-88 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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