# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2018-08-08 · Effective 2018-09-12 · 83 FR 38957
## Document
- **Document number:** 2018-16509
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 38957
- **Publication date:** 2018-08-08
- **Effective date:** 2018-09-12
- **FAA docket:** Docket No. FAA-2018-0276
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-100, -100B, -100B SUD, -200B, -200C, - 200F, -300, -400, -400D, 747SP, and 747SR, and 747-8 series airplanes. This AD was prompted by reports indicating that additional areas of Boeing Material Specification (BMS) 8-39 flexible urethane foam were found during an inspection required by a related AD. This AD requires inspecting for BMS 8-39 flexible urethane foam insulation in the floor panel assemblies and the power drive unit (PDU) cover assemblies, doing applicable on-condition actions, modifying certain dripshields, and replacing BMS 8-39 foam strips on certain dripshields with BMS 8-371 foam strips. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/08/08/2018-16509/airworthiness-directives-the-boeing-company-airplanes)
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