AD 64-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707, 720 and 727 Series Aircraft |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707, 720 and 727 Series Aircraft |
Unsafe Condition
The phenolic insulation on fuel tank clamp rings may degrade, leading to improper sealing and potential fuel leakage.
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Required Actions
Remove fuel tank access panels and clamp rings, clean mating surfaces to base metal, apply conductive anticorrosive mixture, and reinstall following Boeing Service Bulletins or FAA-approved methods.
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Compliance Time
Compliance required as soon as the modification can be scheduled but not later than 1,000 hours' time in service after the effective date of this AD unless already accomplished.
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Affected Aircraft
Boeing Models 707, 720, and 727 Series Aircraft, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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