AD 77-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12C | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12L | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12L4 | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E-L | Airworthiness Directives; Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 Helicopters |
Unsafe Condition
Hazardous engine power loss from inadvertent shutoff of the fuel control valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a guard on the fuel shutoff valve handle in accordance with Hiller Service Bulletin No. 72-1 dated June 17, 1977, or later FAA approved revision. Equivalent methods may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hiller Models UH-12C, UH-12D, UH-12E, UH-12L, UH-12E-L, and UH-12L4 helicopters with control levers P/N 72229 or 72210, all serial numbers up to No. 5024.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.