AD 80-19-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; HILLER AVIATION Models UH-12D and UH-12E (including 4-place) Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; HILLER AVIATION Models UH-12D and UH-12E (including 4-place) Helicopters |
Unsafe Condition
Engine, transmission, or driveline failure and resultant loss of power due to the Soloy Part Number 560-2408-2 engine output coupling shaft.
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Required Actions
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 FAA.
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Compliance Time
within 500-hours operating time or 180 days, whichever occurs first, after the effective date of this AD
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Affected Aircraft
Hiller Aviation Models UH-12D and UH-12E (including 4-place) helicopters converted to turbine power under Soloy Conversions, Ltd. Supplemental Type Certificates SH177WE or SH178WE
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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