AD 64-17-01
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 and malfunctions in the fuel dump chute extend limit switch and up limit switch (P/N's 5EN11-6B, H11-186, 2EN15-6, H11-162) cause switch overheating sufficient to scorch connecting wires.
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Required Actions
Within 500 hours' time in service after the effective date, and every 500 hours thereafter, perform resistance checks on the fuel dump chute limit switches. Replace defective switches before further flight. Within 2,500 hours' time in service after August 17, 1964, replace switches without sealed receptacles with improved switches per Boeing SB 1877, and replace pigtail wires with new wires and sealed connectors.
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Compliance Time
Within 500 hours' time in service after the effective date of this AD, and thereafter at periods not to exceed 500 hours' time in service. For replacement actions, within the next 2,500 hours' time in service after August 17, 1964.
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Affected Aircraft
Boeing Models 707 and 720 Series Aircraft with fuel dump chute systems using limit switches P/N 5EN11-6B, H11-186, 2EN15-6, or H11-162.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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