AD 53-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | UH-12 | Airworthiness Directives; Hiller Models UH-12, UH-12A and UH-12B Helicopters |
| aircraft | Hiller Aviation | UH-12A | Airworthiness Directives; Hiller Models UH-12, UH-12A and UH-12B Helicopters |
| aircraft | Hiller Aviation | UH-12B | Airworthiness Directives; Hiller Models UH-12, UH-12A and UH-12B Helicopters |
Unsafe Condition
Failure of the tail rotor pitch change rod, P/N 25036 or 25009, in the shoulder area due to cracks, resulting in loss of directional control.
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Required Actions
Inspect the pitch change rod via dye penetrant method in the shoulder area before next flight and every 10 hours of operating time. If cracks are found, remove the rod from service. If no cracks, reinstall components ensuring proper torque and clearance. Install bracket P/N 25104 as soon as possible but no later than January 31, 1954, to discontinue 10-hour inspections.
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Compliance Time
Prior to the next flight and thereafter at periods not to exceed 10 hours operating time. Install bracket P/N 25104 as soon as possible but not later than January 31, 1954.
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Affected Aircraft
Hiller Models UH-12, UH-12A, and UH-12B helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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