AD 64-22-01
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
Failures of the fuel tank vent float valve arms causing the float to break loose from the main valve assembly, allowing the vent valve to remain open and permit fuel to spill out the wing tip vent scoop under some flight conditions.
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Required Actions
Within 500 hours' time in service after the effective date, inspect the reserve fuel tank vent valve assemblies for cracks or deformation every 1,000 hours until modification is done. Replace failed or damaged parts before further flight. Install a float stop bracket assembly (Boeing P/N 69-31399-1) per Boeing Service Bulletin No. 1958 within 6,000 hours' time in service.
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Compliance Time
Within 500 hours' time in service after the effective date of this directive and within every 1,000 hours time in service thereafter until compliance with (b) has been accomplished
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Affected Aircraft
Boeing Models 707 and 720 Series Aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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