AD 2018-09-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
cracks in the frame web common to the stringer ties adjacent to the air-conditioning support brackets, which could result in a severed frame, and, in combination with potential multiple site damage (MSD) at the stringer S-10 lap splice or chem-milled skin cracks, could result in possible rapid decompression and loss of structural integrity of the airplane.
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Required Actions
an inspection of the frame for any air-conditioning bracket assembly or intercostal, and, depending on the results, repetitive inspections of the frame web for cracking of certain locations, and applicable on-condition actions.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 737-200, -300, -400, and -500 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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