AD 81-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; HILLER AIRCRAFT Models UH-12D, UH-12E, OH-23G, UH-12L Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12L | Airworthiness Directives; HILLER AIRCRAFT Models UH-12D, UH-12E, OH-23G, UH-12L Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; HILLER AIRCRAFT Models UH-12D, UH-12E, OH-23G, UH-12L Helicopters |
Unsafe Condition
Rudder balance cables (P/N HS 1053-2) may fray and break due to non-conformance with the type design requiring 7 x 19 cable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time visual inspection of the rudder balance cable assembly per Hiller Service Bulletin No. 32-2 Part II, Subparts A and B. Remove non-conforming rudder cable assemblies (P/N HS 1053-2) from service. Use special flight permits under FAR 21.197/21.199 to relocate aircraft for AD compliance.
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Compliance Time
within ten (10) calendar days from the effective date of this AD
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Affected Aircraft
Hiller Aircraft Models UH-12D, UH-12E, OH-23G, UH-12L, and all models converted to turbine power via STC 177WE or STC 178WE
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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