# Airworthiness Directives; Fokker Model F.27 Mark 050 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-10-20 · Effective 1999-11-04 · 64 FR 56422
## Document
- **Document number:** 99-26933
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F.27 Mark 050 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 56422
- **Publication date:** 1999-10-20
- **Effective date:** 1999-11-04
- **FAA docket:** Docket No. 99-NM-225-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F.27 Mark 050 series airplanes. This action requires a one-time inspection to detect improper installation of countersunk screws used to attach the access panels to the bottom skin of the center wing; and corrective action, if necessary. 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 detect and correct such improper installation, which could result in fatigue cracking of the bottom skin of the center wing and consequent reduced structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/10/20/99-26933/airworthiness-directives-fokker-model-f27-mark-050-series-airplanes)
---
*MORVS · CC0 1.0*