AD 81-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Model A109A Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Model A109A Helicopters |
Unsafe Condition
Failure of a tail rotor drive shaft support bearing (P/N 109-0424-01-1) could lead to tail rotor drive shaft failure and hazardous loss of directional control.
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Required Actions
Visually check all seven tail rotor drive shaft support bearings daily for damage, overheat, looseness, slippage, or loss of lubricant. If issues are found, inspect, relubricate, or replace bearings and associated parts per Agusta Bollettino Tecnico No. 109-30 steps 1-4. Inspect and relubricate or replace bearings every 600 hours time in service, starting within 25 hours after the effective date.
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Compliance Time
Before the first flight of each day after the effective date of this AD for daily checks; within 25 hours' time in service after the effective date and thereafter every 600 hours' time in service for inspections and relubrication.
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Affected Aircraft
Agusta S.p.A. Model A109A and A109A II helicopters with tail rotor drive shaft support bearings P/N 109-0424-01-1 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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