# Airworthiness Directives; Fokker Model F28 Mark 0070 and 0100 Series Airplanes
> **Rule** · Final rule. · Published 1997-11-28 · Effective 1998-01-02 · 62 FR 63260
## Document
- **Document number:** 97-31021
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F28 Mark 0070 and 0100 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 63260
- **Publication date:** 1997-11-28
- **Effective date:** 1998-01-02
- **FAA docket:** Docket No. 95-NM-29-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0070 and 0100 series airplanes, that requires a one-time operational test of a certain pitot heating system, repair or replacement of failed elements, and repair or replacement of the pitot heating system with a new improved system. This amendment also requires installation of new power supply wiring with increased gauge thickness, and a circuit breaker with an increased amperage rating. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent icing of the No. 1 pitot tube, which could result in failure of the No. 1 Air Data Computer, or output of erroneous airspeed data to all on-side subsidiary systems, including the Automatic Flight Control and Augmentation System.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/11/28/97-31021/airworthiness-directives-fokker-model-f28-mark-0070-and-0100-series-airplanes)
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