# Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1998-01-13 · Effective 1998-01-28 · 63 FR 1907
## Document
- **Document number:** 98-311
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F27 Mark 050 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 63 FR 1907
- **Publication date:** 1998-01-13
- **Effective date:** 1998-01-28
- **FAA docket:** Docket No. 97-NM-247-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. This action requires replacement of the spring tab balance units in the ailerons and the inboard aileron hinge bolts and bearings with improved parts. 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 failure of the aileron gustlock mechanism and the inboard aileron hinge bolt, which could result in inability to operate the ailerons, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/01/13/98-311/airworthiness-directives-fokker-model-f27-mark-050-series-airplanes)
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