AD 62-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters |
Unsafe Condition
Overheating or abnormal wear of the transmission planetary system components and inadequate oil warmup and shutdown procedures leading to potential transmission failure.
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Required Actions
Install cockpit placards for oil warmup and temperature restriction, inspect and modify transmission lubrication system with specified parts, and replace worn components. Conduct inspections every 25 hours time-in-service and complete major modification within 100 hours.
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Compliance Time
Within specified timeframes: 10 hours time-in-service for initial inspections and placards, every 25 hours thereafter for inspections, and within 100 hours for transmission modification. Effective upon Federal Register publication except those notified by telegram.
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Affected Aircraft
Hiller Models UH-12D and UH-12E Serial Numbers 942, 954, 2001 through 2198 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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