# Proposed AD 98-NM-295-AD: Bombardier Model DHC-7 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-03-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 30, 1998, 63 FR 65716
- Comments due: December 30, 1998
- Became: [AD 99-03-07](https://openairdocs.org/ad/99-03-07)
- Docket: 98-NM-295-AD
- FR document: 98-31700
- Official PDF: https://openairdocs.org/files/sha256/16/d4/16d47be6fd6a33d23cafc8f08fec355523bd71714a5b081414728e580919d1fe (from https://www.govinfo.gov/content/pkg/FR-1998-11-30/pdf/98-31700.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/11/30/98-31700/airworthiness-directives-bombardier-model-dhc-7-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-295-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Bombardier Model DHC-7 series airplanes. This proposal would require removal of all attachment bolts and pre-load indicating (PLI) washers of the wing-to-fuselage attachment fittings; a one-time visual inspection to detect corrosion of each attachment bolt; and installation of new attachment bolts and PLI washers of the wing-to-fuselage attachment fittings. 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 prevent failure of the attachment bolts of the wing-to-fuselage attachment fittings due to stress corrosion cracking, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Nov 30, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-31700, comments due Dec 30, 1998 (https://www.federalregister.gov/documents/1998/11/30/98-31700/airworthiness-directives-bombardier-model-dhc-7-series-airplanes)

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