# 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
> **Rule** · Final rule. · Published 2007-09-26 · Effective 2007-10-31 · 72 FR 54533
## Document
- **Document number:** E7-18747
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 72 FR 54533
- **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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/09/26/E7-18747/airworthiness-directives-boeing-model-747-100b-sud-747-200b-747-200c-747-200f-747-300-747-400)
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