AD 70-22-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Fuel leakage and possible engine fire due to a damaged or misaligned engine cowl fluid drain bellows seal.
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Required Actions
Inspect the bellows seal on the gang drain assembly each time the engine cowl doors are closed to ensure proper seal installation and seating on the drain duct. Inspect the aft fuel drain duct for proper alignment and modify the engine fluid drain bellows seal. Modify the engine gang drain bellows seal in accordance with specified service bulletins.
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Compliance Time
Within the next 100 hours' time in service after the effective date of this AD
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Affected Aircraft
BOEING Model 747 Series Airplanes including 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, and other 747 series models.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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