AD 2000-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-600 | Airworthiness Directives; Boeing Model 737-600, -700, and -800 Series Airplanes |
Unsafe Condition
Cracking of the rear spar stiffeners in the wing center section, initiated at fastener holes below the lower chord of the rear spar, which could lead to failure of the keel beam structure.
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Required Actions
Perform a one-time high-frequency eddy current inspection to detect cracking of the rear spar stiffeners at the left and right buttock lines 6.15. For crack-free stiffeners, install nested angles as a preventive modification. For cracked stiffeners, repair them using a method approved by the FAA or a Boeing Company Designated Engineering Representative.
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Compliance Time
Within 60 days after the effective date of this AD or prior to the accumulation of the total number of flight cycles specified in Table 1 of Boeing Service Bulletin 737-57-1253, whichever occurs later.
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Affected Aircraft
Boeing Model 737-600, -700, and -800 series airplanes, certificated in any category, line numbers 1 through 321 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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