AD 64-01-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707 and 720 Series Airplanes |
Unsafe Condition
Engine burner case burn through in service resulted in damage to the nacelle and lower strut due to delayed fire detection as there are no fire detector elements in the area on top of the engine between nacelle Stations 160 and 180.
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Required Actions
Install additional fire detector elements (continuous or unit type) between the horizontal firewall and the top of the engine in the area between nacelle Stations 160 and 180, in accordance with Boeing Service Bulletin No. 1788 or an approved installation.
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Compliance Time
within 6,000 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
All Models 707 and 720 Series Airplanes listed in Boeing Service Bulletin No. 1788.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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