# Proposed AD 97-NM-118-AD: Short Brothers Model SD3-60 SHERPA and SD3 SHERPA Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-03-13
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 19, 1997, 62 FR 61703
- Comments due: December 19, 1997
- Became: [AD 98-03-13](https://openairdocs.org/ad/98-03-13)
- Docket: 97-NM-118-AD
- FR document: 97-30329
- Official PDF: https://openairdocs.org/files/sha256/e6/b4/e6b4ce559ab84367df3b511f430385277c90e863fce397223fa196a06e19dc25 (from https://www.govinfo.gov/content/pkg/FR-1997-11-19/pdf/97-30329.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/11/19/97-30329/airworthiness-directives-short-brothers-model-sd3-60-sherpa-and-sd3-sherpa-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-118-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Short Brothers Model SD3-60 SHERPA and SD3 SHERPA series airplanes. This proposal would require removing the aluminum alloy oxygen pipe assembly and replacing it with a stainless steel assembly. This proposal is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent aluminum oxygen tubing from bursting and releasing a high-pressure oxygen flow into the passenger cabin, which could result in a fire hazard during flight.

## Notices in this docket

- Nov 19, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-30329, comments due Dec 19, 1997 (https://www.federalregister.gov/documents/1997/11/19/97-30329/airworthiness-directives-short-brothers-model-sd3-60-sherpa-and-sd3-sherpa-series-airplanes)

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