AD 2008-04-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-300 | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes |
Unsafe Condition
Cracking of the body buttock line (BBL) 0.07 floor beam between body station (BS) 651 and BS 676, and between BS 698 and BS 717, due to fatigue. This could result in failure of the main deck floor beams and rapid decompression of the airplane.
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Required Actions
Inspect the BBL 0.07 floor beam for cracking between specified body stations. Perform investigative and corrective actions if cracking is found. Optional terminating action is available for repetitive inspections.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 737-300, -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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