# Proposed AD 98-NM-365-AD: Aerospatiale Model SN-601 (Corvette) Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-23-06
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 10, 1999, 64 FR 49113
- Comments due: October 12, 1999
- Became: [AD 99-23-06](https://openairdocs.org/ad/99-23-06)
- Docket: 98-NM-365-AD
- FR document: 99-23621
- Official PDF: https://openairdocs.org/files/sha256/fe/f0/fef037870016a6bae153c437a2705193598fd62958553f5ef56c491368741e62 (from https://www.govinfo.gov/content/pkg/FR-1999-09-10/pdf/99-23621.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/09/10/99-23621/airworthiness-directives-aerospatiale-model-sn-601-corvette-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-365-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Aerospatiale Model SN-601 (Corvette) series airplanes. This proposal would require repetitive inspections, and repair if necessary, of the locking indication system of the drag strut jack on the main landing gear (MLG) to detect corrosion and damage resulting from its operation. This proposal would also require replacement of seals and backup rings with new parts. 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 locking indication system of the drag strut jack on the MLG due to corrosion. Such corrosion could prevent the MLG from locking and result in the subsequent collapse of the MLG.

## Notices in this docket

- Sep 10, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-23621, comments due Oct 12, 1999 (https://www.federalregister.gov/documents/1999/09/10/99-23621/airworthiness-directives-aerospatiale-model-sn-601-corvette-series-airplanes)

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