AD 81-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109 | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA (CAGA): Models A109 and A109A Series Helicopters |
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA (CAGA): Models A109 and A109A Series Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA (CAGA): Models A109 and A109A Series Helicopters |
Unsafe Condition
Loss of the main rotor blade pitch control due to overtorque of the main rotor pitch horn trunion assembly and nut P/N MS 17825-7.
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Required Actions
Hand correct CAGA manuals by updating torque values, remove and replace nut P/N MS 17825-7 within 25 hours time in service, inspect threaded area P/N 109-0101-09-1 for deformation, and reinstall trunion assembly with specified torque and play check. Report defects to FAA as required.
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Compliance Time
Before further flight and within the next 25 hours time in service after the effective date of this AD.
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Affected Aircraft
Agusta S.p.A. Models A109, A109A, and A109A II helicopters certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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