AD 73-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | UH-12D | Airworthiness Directives; Hiller Model UH-12D Helicopters |
Unsafe Condition
Finite life components may exceed their service life limits, leading to failure or malfunction.
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Required Actions
Replace the finite life components listed in Hiller Aviation's UH-12D Inspection Guide, Airworthiness Limitations Section, dated November 5, 1973, with new or serviceable parts at the times specified therein.
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Compliance Time
Prior to further flight for helicopters converted from the military version (H-23D) before the effective date of this AD, and at the time of conversion for those converted after the effective date.
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Affected Aircraft
Hiller Aviation Model UH-12D helicopters certificated in all categories, including those converted from the military version (H-23D).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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