AD 64-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707 and 720 Series Aircraft |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707 and 720 Series Aircraft |
Unsafe Condition
Cracks have occurred in the nacelle strut upper support fitting, which if allowed to progress, can result in failure of the upper support fitting.
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Required Actions
Visually inspect all surfaces of the upper and lower flanges of the nacelle strut upper support fitting for lateral cracks emanating from each clip or bracket attach hole. Replace the fitting with a new fitting of the same part number before further flight if cracks are found. Modify each inner and outer nacelle strut upper support fitting in accordance with Boeing Service Bulletins 1798(R-1) or 1798(R-2) within specified timeframes.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Boeing Models 707 and 720 Series Aircraft listed in Boeing Service Bulletin No. 1798(R-1).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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