AD 2012-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Fatigue cracking of the fuselage skin panels at the chem-mill steps, which could result in sudden fracture and failure of the fuselage skin panels, and consequent rapid decompression of the airplane.
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Required Actions
Inspect the fuselage skin along the chem-mill steps at stringers S-1 and S-2R, between station (STA) 400 and STA 460, for cracks. Add inspections for cracking in additional fuselage skin locations. Repair if necessary. Reduce inspection thresholds and repetitive intervals for certain airplanes. Optional modification of chem-milled steps may eliminate the need for repetitive inspections.
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Compliance Time
Within the compliance times specified in Boeing Service Bulletin 737-53A1293, Revision 2, dated August 10, 2011, or as determined by the AD effective date.
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Affected Aircraft
The Boeing Company Model 737-300, -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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