# Proposed AD 98-NM-143-AD: de Havilland Model DHC-7 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-23-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 3, 1998, 63 FR 46925
- Comments due: October 5, 1998
- Became: [AD 98-23-12](https://openairdocs.org/ad/98-23-12)
- Docket: 98-NM-143-AD
- FR document: 98-23743
- Official PDF: https://openairdocs.org/files/sha256/4d/23/4d23b4c70371f9ecf12d8224585575b5603fa6ff7cdcc7acb3b924881145d829 (from https://www.govinfo.gov/content/pkg/FR-1998-09-03/pdf/98-23743.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/09/03/98-23743/airworthiness-directives-de-havilland-model-dhc-7-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-143-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all de Havilland Model DHC- 7 series airplanes, that currently requires certain structural inspections, and repair, if necessary. This action would require certain structural inspection. 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 correct fatigue cracking in certain significant structural areas, which could reduce the structural integrity of these airplanes.

## Notices in this docket

- Sep 3, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-23743, comments due Oct 5, 1998 (https://www.federalregister.gov/documents/1998/09/03/98-23743/airworthiness-directives-de-havilland-model-dhc-7-series-airplanes)

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