AD 79-20-11
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
Failure of the lightning protection design of the fuel system could result in fuel tank ignition sources due to lightning strikes.
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Required Actions
Accomplish modifications to the outboard wing fuel system components, install wiring shrouds and a relay circuit for the fuel quantity system, and replace nonmetallic fuel tank and dry bay access doors as per specified service bulletins or equivalent FAA-approved methods.
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Compliance Time
Within 5000 hours time in service or fifteen calendar months from the effective date, whichever occurs first
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Affected Aircraft
Boeing Model 747 series airplanes certificated in all categories, including 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, and other 747-200 series models.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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