AD 2016-18-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. | Airworthiness Directives; Agusta S.p.A. Helicopters |
Unsafe Condition
A crack in the tail rotor drive shaft assembly (drive shaft) could result in failure of the drive shaft, failure of the tail rotor, and subsequent loss of helicopter control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect each drive shaft in accordance with specified AgustaWestland Bollettino Tecnico (BT) instructions. If a crack is found, replace the drive shaft before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service
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Affected Aircraft
Agusta S.p.A. Model A109A, A109A II, A109C, A109E, A109K2, A109S, and AW109SP helicopters with a tail rotor drive shaft assembly (drive shaft) part number 109-8412-02-1 or 109-8412-02-3 installed.
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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