# Airworthiness Directives; Boeing Model 747 Series Airplanes
> **Rule** · Final rule. · Published 1999-04-07 · Effective 1999-05-12 · 64 FR 16810
## Document
- **Document number:** 99-8309
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 16810
- **Publication date:** 1999-04-07
- **Effective date:** 1999-05-12
- **FAA docket:** Docket No. 97-NM-326-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires repetitive detailed visual inspections for corrosion, and repetitive high frequency eddy current (HFEC) inspections for cracks, of the upper link assembly on the number 2 and number 3 engine struts, and corrective actions, if necessary. This amendment is prompted by reports of corrosion and cracks located at the four fasteners that attach to the aft end to the upper link assembly on the number 2 and number 3 engine struts. The actions specified by this AD are intended to prevent failure of the upper link due to cracking or corrosion, subsequent damage to other strut support structure, and in-flight separation of an engine from the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/04/07/99-8309/airworthiness-directives-boeing-model-747-series-airplanes)
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