# Airworthiness Directives; Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 Series Airplanes
> **Rule** · Final rule. · Published 1998-08-14 · Effective 1998-09-18 · 63 FR 43610
## Document
- **Document number:** 98-21654
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 43610
- **Publication date:** 1998-08-14
- **Effective date:** 1998-09-18
- **FAA docket:** Docket No. 97-NM-287-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 series airplanes, that requires repetitive inspections to detect any discrepancy in the sealwire of the fireguards of the engine fire shut- off system, and repair, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent inadvertent closure of the fire shut-off valves due to ineffective or absent sealwires, which could result in in-flight engine shutdown.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/08/14/98-21654/airworthiness-directives-fokker-model-f28-mark-1000-2000-3000-and-4000-series-airplanes)
---
*AI Analytics · CC0 1.0*