AD 2021-21-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
fatigue cracks in the webs of the aft pressure bulkhead, which could result in rapid decompression of the airplane.
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Required Actions
repetitive inspections for cracking of the webs of the aft pressure bulkhead at a certain body station, and corrective action if necessary, including a general visual inspection for existing repairs, repetitive detailed and high frequency eddy current (HFEC) inspections for cracks around the web center dome apex fasteners, repetitive low frequency eddy current (LFEC) inspection for cracks around the hidden web lap splice fastener locations, and repair of cracks.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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