AD 2008-18-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Airplanes |
Unsafe Condition
Lightning-induced electrical energy entering a reserve fuel tank through the refuel valve could result in a fuel tank explosion and consequent loss of the airplane.
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Required Actions
Modify the refuel valve control unit for the reserve fuel tanks. Revise the FAA-approved maintenance program to incorporate airworthiness limitation (AWL) No. 28-AWL-20 or AWL No. 28-AWL-25, as applicable.
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Compliance Time
Within 60 months of the effective date (October 17, 2008).
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Affected Aircraft
Boeing Model 747 airplanes, including 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, 747SP, 747-400, 747-400D, and 747-400F series.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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