# Proposed AD 2000-SW-27-AD: Siam Hiller Holdings, Inc. Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-24-21
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 31, 2000, 65 FR 52958
- Comments due: October 30, 2000
- Became: [AD 2000-24-21](https://openairdocs.org/ad/2000-24-21)
- Docket: 2000-SW-27-AD
- FR document: 00-22283
- Official PDF: https://openairdocs.org/files/sha256/db/62/db629a1748d149d6324c60d042e927303dc2eb524753f26973af315945e338ea (from https://www.govinfo.gov/content/pkg/FR-2000-08-31/pdf/00-22283.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/08/31/00-22283/airworthiness-directives-siam-hiller-holdings-inc-model-uh-12-uh-12a-uh-12b-uh-12c-uh-12d-uh-12e
- Page: https://openairdocs.org/proposed/2000-SW-27-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) for Siam Hiller Holdings, Inc. (Hiller), formerly Rogerson Hiller Corporation, Model UH-12, UH-12A, UH-12B, UH-12C, UH- 12D, UH-12E, UH-12E-l, UH-12L, and UH-12L4 helicopters. The AD would require replacing all undrilled-shank bolts at pivoting joints in the control system linkage with drilled-shank bolts and installing castellated nuts and cotter pins. This proposal is prompted by an accident caused by separation of the control system linkage of a Model UH-12E helicopter. The actions specified by the proposed AD are intended to prevent separation of the control system attachments at pivoting points and subsequent loss of control of the helicopter.

## Notices in this docket

- Aug 31, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-22283, comments due Oct 30, 2000 (https://www.federalregister.gov/documents/2000/08/31/00-22283/airworthiness-directives-siam-hiller-holdings-inc-model-uh-12-uh-12a-uh-12b-uh-12c-uh-12d-uh-12e)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.