AD 2020-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
any cracking found in fastener holes at the center wing box, which could result in inability of a principal structural element to sustain limit load and could adversely affect the structural integrity of the airplane.
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Required Actions
inspect the airplane and do all applicable on-condition actions specified in Boeing Alert Requirements Bulletin 737-57A1348 RB, dated June 1, 2020, including repetitive external surface HFEC inspections and repetitive external surface ultrasonic inspections; or repetitive internal detailed inspections; of the center wing box, station 663.75 rear spar, lower skin, and lower chord between left buttock line 31.83 and right buttock line 31.83, for any cracking, and repair if necessary.
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Compliance Time
Within 120 days after the effective date of this AD
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Affected Aircraft
all The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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