# Airworthiness Directives; Boeing Model 727 Airplanes
> **Rule** · Final rule. · Published 2008-01-24 · Effective 2008-02-28 · 73 FR 4053
## Document
- **Document number:** E8-1129
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 727
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 73 FR 4053
- **Publication date:** 2008-01-24
- **Effective date:** 2008-02-28
- **FAA docket:** Docket No. FAA-2007-28884
## Abstract

We are adopting a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This AD requires repetitive external high frequency eddy current (HFEC) inspections of the crown skin for cracks at certain stringer attachment holes, and repair if necessary. This AD results from a report of cracks at multiple locations on certain areas of the crown skin. We are issuing this AD to detect and correct fatigue cracks of the crown skin, which could result in rapid decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/01/24/E8-1129/airworthiness-directives-boeing-model-727-airplanes)
---
*AI Analytics · CC0 1.0*