# AD 80-19-02: Turbine Power - Soloy Conversions

- Type: Airworthiness directive
- Status: Current
- Products: Hiller UH-12D and UH-12E with STC SH177WE or SH178WE
- Effective: October 11, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-3910
- Registered aircraft: 128 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5FEA7D353FE9F0586256A4E0046A9BC.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-19-02

## The airworthiness directive

80-19-02 HILLER AVIATION: Amendment 39-3910. Applies to Hiller UH-12D and UH-12E (including 4-place) helicopters certificated in all categories which have been converted to turbine power under Soloy Conversions, Ltd. Supplemental Type Certificates SH177WE or SH178WE.

Compliance required within 500-hours operating time or 180 days, whichever occurs first, after the effective date of this AD.

To prevent engine, transmission, or driveline failure and the resultant loss of power, replace Soloy Part Number 560-2408-2 engine output coupling shaft with Soloy Part Number 660-2408-3 shaft in accordance with Soloy Service Bulletin Number 12-560 dated May, 21, 1980, or later FAA approved revisions.

Equivalent methods of compliance may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).

All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., Post Office Box 60, Chehalis, Washington 98532. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

This amendment becomes effective October 11, 1980.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4H10](https://openairdocs.org/tcds/4H10): Siam Hiller Holdings Inc.; names 1 of 1 models: UH-12D
- [TCDS 4H11](https://openairdocs.org/tcds/4H11): Siam Hiller Holdings Inc.; names 1 of 2 models: UH-12E

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 128 (128 by airframe model, 0 by engine model)
- Makers: Hiller 125, Hiller-Osborn 2, Hiller-Rogerson Helicopter 1

Models with the most aircraft:

- [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e): 103 aircraft (airframe model)
- [Hiller UH-12D](https://openairdocs.org/model/hiller-uh-12d): 22 aircraft (airframe model)
- [Hiller-Osborn UH-12D](https://openairdocs.org/model/hiller-osborn-uh-12d): 2 aircraft (airframe model)
- [Hiller-Rogerson Helicopter UH12E](https://openairdocs.org/model/hiller-rogerson-helicopter-uh12e): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/80-19-02/models.md
Every aircraft: https://openairdocs.org/ad/80-19-02/aircraft.md

## Related documents

- [STC SH177WE](https://openairdocs.org/stc/SH177WE): Installation of Allison 250-C20/250-C20B engine and related changes.. Siam Hiller Holdings Inc, Named in the applicability
- [STC SH178WE](https://openairdocs.org/stc/SH178WE): Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)). Siam Hiller Holdings Inc, Named in the applicability

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