AD 2000-24-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 707 and 720 | Airworthiness Directives; Boeing Model 707 and 720 Series Airplanes |
Unsafe Condition
Fatigue cracking of certain stringers and around certain fastener holes of the lower skin of the wings, which could result in damage to adjacent structure and consequent reduced structural integrity of the airplane.
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Required Actions
Perform initial and repetitive high frequency eddy current (HFEC) inspections to detect cracking, as specified for Model 707 and 720 series airplanes. If cracking is detected, perform an internal inspection and repair in accordance with approved methods.
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Compliance Time
Within 500 flight cycles for Model 720 series airplanes, and within 150 flight cycles after the effective date for Model 707 series airplanes, with further inspections at specified intervals.
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Affected Aircraft
All Boeing Model 707 and 720 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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