AD 79-19-01 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 720/720B, 707-300, 707-400, 707- 300B, and 707-300C Series Airplanes |
Unsafe Condition
Cracks in the wing lower surface splice stringers may result in fuel leakage and structural failure.
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Required Actions
Perform a low frequency eddy current inspection for cracks in the wing lower surface splice stringers in accordance with Boeing Service Bulletin 3226, Rev. 5, or FAA approved method. If cracks are found, repair prior to further revenue flight. Visual inspection of the inboard nacelle strut drag brace fairing area for cracks and fuel leakage is also required, with high frequency eddy current inspection if issues are found.
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Compliance Time
After the effective date of this amendment (November 15, 1982), inspections must be performed at threshold landings (varies by model) within the prescribed initial interval (varies by model) and at repetitive intervals (varies by model).
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Affected Aircraft
Boeing Model 720/720B, 707-300, 707-400, 707-300B, and 707-300C series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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