AD 2012-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. | Airworthiness Directives; Agusta S.p.A. Helicopters |
Unsafe Condition
A potential fault in the overvoltage protection in GCUs currently installed on Model AB139 and AW139 helicopters. This could result in failure of the overvoltage protection of the GCU, degraded performance of the electrical power generation and distribution systems, or fire, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the No. 1 and No. 2 GCU, P/N 1152550-3. Modify the electrical connectors A13P1 and A14P1 by installing wiring to the power distribution panel. Install a No. 1 and No. 2 GCU with P/N 1152550-4 or 1152550-5, ensuring both GCUs have identical part numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 months from the effective date of the AD.
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Affected Aircraft
Agusta S.p.A. Model AB139 and AW139 helicopters with a generator control unit (GCU), part-number (P/N) 1152550-3 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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