AD Amdt-39-10151
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller | Various | Airworthiness Directives; Hiller Aircraft Corporation Model UH- 12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters |
Unsafe Condition
Cracks in the head area of the main rotor outboard tension-torsion (T-T) bar pin could result in loss of in-plane stability of the main rotor blade and subsequent loss of control of the helicopter.
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Required Actions
Conduct a dye penetrant or magnetic particle inspection of the main rotor outboard T-T bar pin head for cracks. Perform a visual inspection of the outboard T-T bar pin for proper alignment and adjust if necessary. Install shims at the inboard end of the drag strut. Report inspection results only if cracks are found.
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Compliance Time
Before further flight
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Affected Aircraft
Hiller Aircraft Corporation Models UH-12A, UH-12B, UH-12C, UH-12D, and UH-12E helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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