AD 2012-23-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model | Airworthiness Directives; The Boeing Company Model Airplanes |
Unsafe Condition
Fatigue cracking in the frame outboard chord at body station (BS) 727 and in the radius of the auxiliary chord, which could result in reduced structural integrity of the outboard chord and consequent rapid decompression of the airplane.
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Required Actions
Inspect for cracks in the outboard chord of the frame at BS 727 and the radius of the auxiliary chord. Repair or replace cracked parts as necessary. Remove inspections of the outboard chord of stringer (S) 18A.
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Compliance Time
Within 4,500 flight cycles after August 18, 1995, or before the accumulation of 50,000 flight cycles after accomplishing the modification of the outboard chord of the frame, but fewer than or equal to 60,000 flight cycles.
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Affected Aircraft
The Boeing Company Model 737-100 and -200 series airplanes, including additional airplanes added to the applicability statement.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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