AD 80-15-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Model A109A Series Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Model A109A Series Helicopters |
Unsafe Condition
Failure of the main rotor mast upper thrust bearing due to potential cracks or damage on the bearing inner race P/N 109-0404-14.
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Required Actions
Within 25 hours time in service after the effective date, inspect for oil leaks between the swashplate support and main transmission upper case flange. If leaks are found, inspect the bearing inner race for cracks/damage; replace packing or bearing inner race as needed. After each flight, conduct inspections per paragraph (d). Within 200 hours time in service, replace bearing inner race P/N 109-0404-14 with P/N 109-0404-14-15 for most helicopters except specified serial numbers. Gearboxes S/N 58 and below must replace the bearing before service.
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Compliance Time
Within the next 25 hours time in service after the effective date of this AD, and within the next 200 hours time in service after the effective date for paragraph (e).
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Affected Aircraft
Agusta S.p.A. Model A109A series helicopters, all serial numbers up to S/N 7165 inclusive, with main rotor mast bearing inner race P/N 109-0404-14 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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