AD 2009-09-06
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
Fatigue cracking of the backup intercostals and upper sill web of the forward airstair doorway, which could result in a rapid loss of cabin pressure.
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Required Actions
Perform repetitive detailed and high frequency eddy current inspections to detect cracks of the backup intercostals and the upper sill of the forward airstair doorway, and apply applicable corrective actions before further flight. The inspections and corrective actions must be accomplished according to the Accomplishment Instructions in Boeing Alert Service Bulletin 737-53A1269.
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Compliance Time
Within the specified compliance times listed in the tables of Boeing Alert Service Bulletin 737-53A1269, or within 4,500 flight cycles if no crack is found during any inspection.
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Affected Aircraft
Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-53A1269, dated May 17, 2007.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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