# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-11-26 · Effective 2012-12-31 · 77 FR 70355
## Document
- **Document number:** 2012-27908
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 70355
- **Publication date:** 2012-11-26
- **Effective date:** 2012-12-31
- **FAA docket:** Docket No. FAA-2012-0595
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by reports of failure of wire support clamps in the forward section of the aft pressure bulkhead. This AD requires a detailed inspection of the clamps on the power feeder cable of the auxiliary power unit (APU) to determine if certain clamps are installed, and related investigative and corrective actions if necessary. We are issuing this AD to prevent failure of the clamp, which could result in wire chafing and potential arcing and consequent fire in section 48 (a flammable fluid leakage zone) or heat damage to the APU power feeder cable, insulation blankets, or pressure bulkhead.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/11/26/2012-27908/airworthiness-directives-the-boeing-company-airplanes)
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