AD 2021-16-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leonardo | S.p.a. | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
cracks or damage on the vertical fin vibration absorber installation and surrounding structure, which could affect the structural integrity of the helicopter and lead to subsequent loss of control.
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Required Actions
repetitive inspections of the vertical fin vibration absorber installation and the surrounding structure, and depending on the inspection results, removing certain parts from service, replacing the rib assembly, shim, doubler, and bracket, and inspecting the rib assembly and vertical fin vibration absorber installation.
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Compliance Time
Within 50 flight hours, and thereafter at intervals not to exceed 100 hours TIS, and within 12 months TIS, removing the vertical fin vibration absorber installation from service.
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Affected Aircraft
Leonardo S.p.a. Model A109S helicopters and AW109SP helicopters, certificated in any category, with vertical fin vibration absorber installation part number (P/N) 109-B810-79-101 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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