AD 2005-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-100 | Airworthiness Directives; Boeing Model 737-100, -200, -200C, -300, -400, and -500 Series Airplanes |
Unsafe Condition
Reports of cracks in the stiffeners at left buttock line (LBL) and right buttock line (RBL) 6.15 on the rear spar of the wing center section, which could result in damage to the keel beam structure and reduce the capability of the airplane to sustain flight loads.
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Required Actions
Inspect the stiffeners at LBL and RBL 6.15 for cracks. Replace both stiffeners with new, improved stiffeners if any stiffener is found cracked. Alternatively, replace both stiffeners with new, improved stiffeners to terminate repetitive inspections.
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Compliance Time
Within 180 days of the effective date (November 1, 2005) for airplanes with less than 30,000 total flight cycles, and within 12 months of the effective date for airplanes with 30,000 or more total flight cycles.
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Affected Aircraft
All Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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