# Proposed AD 99-NM-325-AD: Fokker Model F.28 Mark 0070 and 0100 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-04-04
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 6, 1999, 64 FR 68056
- Comments due: January 5, 2000
- Became: [AD 2000-04-04](https://openairdocs.org/ad/2000-04-04)
- Docket: 99-NM-325-AD
- FR document: 99-31475
- Official PDF: https://openairdocs.org/files/sha256/c6/79/c6795aac24d68fbb044226a32897ddb0871ac26f91f69bcb25f3b4cad928e28a (from https://www.govinfo.gov/content/pkg/FR-1999-12-06/pdf/99-31475.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/12/06/99-31475/airworthiness-directives-fokker-model-f28-mark-0070-and-0100-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-325-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Fokker Model F.28 Mark 0070 and 0100 series airplanes. This proposal would require a measurement of the resistance of the electrical connectors of the auxiliary power unit (APU) to detect a short circuit; an inspection to determine if the grommets or shrink sleeves are present; and modification, if necessary. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to detect and prevent a short circuit of a fire extinguisher electrical system due to a lack of shrink sleeves or grommets, and consequent disabling of the affected fire extinguisher system.

## Notices in this docket

- Dec 6, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31475, comments due Jan 5, 2000 (https://www.federalregister.gov/documents/1999/12/06/99-31475/airworthiness-directives-fokker-model-f28-mark-0070-and-0100-series-airplanes)

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