# Proposed AD 98-NM-369-AD: Short Brothers Model SD3-SHERPA, SD3-60 SHERPA, SD3-30, and SD3-60 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-18-10
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 28, 1999, 64 FR 34575
- Comments due: July 28, 1999
- Became: [AD 99-18-10](https://openairdocs.org/ad/99-18-10)
- Docket: 98-NM-369-AD
- FR document: 99-16336
- Official PDF: https://openairdocs.org/files/sha256/3f/6d/3f6d97ef8b5a744ea6ceb336aebd9ca6b68f9a03136fb613a122a6341a23fbe1 (from https://www.govinfo.gov/content/pkg/FR-1999-06-28/pdf/99-16336.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/06/28/99-16336/airworthiness-directives-short-brothers-model-sd3-sherpa-sd3-60-sherpa-sd3-30-and-sd3-60-series
- Page: https://openairdocs.org/proposed/98-NM-369-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Short Brothers Model SD3- SHERPA, SD3-60 SHERPA, SD3-30, and SD3-60 series airplanes. This proposal would require a one-time visual inspection of the emergency brake accumulator mounting structure for evidence of cracking; and corrective action, 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 prevent failure of the mounting angle that supports the emergency brake system due to cracking, which could result in loss of the emergency brake system.

## Notices in this docket

- Jun 28, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-16336, comments due Jul 28, 1999 (https://www.federalregister.gov/documents/1999/06/28/99-16336/airworthiness-directives-short-brothers-model-sd3-sherpa-sd3-60-sherpa-sd3-30-and-sd3-60-series)

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