# Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-12-29 · Effective 2000-01-13 · 64 FR 72913
## Document
- **Document number:** 99-33567
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F27 Mark 050 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 72913
- **Publication date:** 1999-12-29
- **Effective date:** 2000-01-13
- **FAA docket:** Docket No. 99-NM-235-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. This action requires repetitive inspections of the connections between certain ribs and stringers of the wing skins to detect loose or missing rivets or gaps, and corrective actions, if necessary. This action also requires eventual modification of the rib-stringer connection, which terminates the repetitive inspections. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent fatigue cracking in the skin and stringers, which could result in reduced structural integrity of the wings.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/12/29/99-33567/airworthiness-directives-fokker-model-f27-mark-050-series-airplanes)
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