AD 84-19-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E-L | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
Unsafe Condition
Cracks in the gusset weld beads of engine mount Part No. 63181-5 due to fatigue from turbine power conversion under STC SH177WE or SH178WE.
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Required Actions
Remove paint from the outer gimbal forward attach fitting of engine mount Part No. 63181-5 and perform dye penetrant or magnetic particle inspection of the gusset weld beads for cracks on both sides. Replace the engine mount if cracks are found before further flight.
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Compliance Time
Within the next 20 hours time in service after the effective date, and thereafter at intervals not to exceed 600 hours time in service from the last inspection.
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Affected Aircraft
HILLER HELICOPTERS Model UH-12D and UH-12E series helicopters equipped with engine mount Part No. 63181-5 and converted to turbine power via STC SH177WE or SH178WE.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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