# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-11-21 · Effective 2012-12-26 · 77 FR 69739
## Document
- **Document number:** 2012-27637
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 69739
- **Publication date:** 2012-11-21
- **Effective date:** 2012-12-26
- **FAA docket:** Docket No. FAA-2012-0498
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400, -400D, and -400F series airplanes. This AD was prompted by reports of crown frame web cracking at left buttock line (LBL) 15.0, station (STA) 320. This AD requires measuring the web at STA 320 and, depending on findings, various inspections for cracks and missing fasteners, web and fastener replacement, and related investigative and corrective actions if necessary. We are issuing this AD to prevent complete fracture of the crown frame assembly, and consequent damage to the skin and in-flight decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/11/21/2012-27637/airworthiness-directives-the-boeing-company-airplanes)
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