AD 2012-21-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. | Airworthiness Directives; Agusta S.p.A. Helicopters |
Unsafe Condition
Failure of the 35 ampere (amp) 'BATT BUS', which could result in an electrical failure and fire, loss of electrical power to instruments powered by the 'BATT BUS' system, and subsequent loss of control of the helicopter.
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Required Actions
Within 50 hours time-in-service, modify the electrical power distribution system by installing the 'BATT BUS' Circuit Breaker Modification Kit, part number 109-0824-73-107, and operationally test the electrical system by following specified paragraphs of Agusta Bollettino Tecnico No. 109S-35.
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Compliance Time
Within 50 hours time-in-service
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Affected Aircraft
Agusta S.p.A. Model A109S helicopters, serial numbers up to and including 22151, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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