# Airworthiness Directives; 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
> **Rule** · Final rule. · Published 2000-12-06 · Effective 2001-01-10 · 65 FR 76149
## Document
- **Document number:** 00-30652
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 76149
- **Publication date:** 2000-12-06
- **Effective date:** 2001-01-10
- **FAA docket:** Docket No. 2000-SW-27-AD
## Abstract

This amendment adopts 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, that requires 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 amendment is prompted by an accident caused by separation of the control system linkage of a Model UH-12E helicopter. The actions specified by this AD are intended to prevent separation of the control system attachments at pivoting points and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/12/06/00-30652/airworthiness-directives-siam-hiller-holdings-inc-model-uh-12-uh-12a-uh-12b-uh-12c-uh-12d-uh-12e)
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