Airworthiness Directives; Boeing Model 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, and 747SP Series Airplanes
airworthiness · Rule · Final rule. · Published 2007-09-26 · Effective 2007-10-31 · 72 FR 54533
Document
Document number
E7-18747
Federal Register citation
72 FR 54533
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2007-09-26
Effective date
2007-10-31
FAA docket
Docket No. FAA-2007-28349
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-100B SUD, 747-200B, 747-200C, 747-200F, 747- 300, 747-400, 747-400D, 747-400F, and 747SP series airplanes. This AD requires reconfiguring the clamps of certain wire bundles and applying insulating sealant to certain fasteners inside the fuel tanks. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent arcing inside the fuel tanks in the event of a lightning strike or high-powered short circuit, which could result in a fuel tank explosion or fire.