# Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2001-08-06 · Effective 2001-08-21 · 66 FR 40878
## Document
- **Document number:** 01-19260
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F27 Mark 050 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 40878
- **Publication date:** 2001-08-06
- **Effective date:** 2001-08-21
- **FAA docket:** Docket No. 2001-NM-141-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. This action requires installation of a filler plate and a doubler to reinforce the area under the top antenna for the Traffic Collision Avoidance System (TCAS). This action is necessary to prevent cracking due to fatigue in the area under the antenna for the TCAS, which could result in reduced structural capability of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/06/01-19260/airworthiness-directives-fokker-model-f27-mark-050-series-airplanes)
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