AD 2011-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. (Agusta) Model AB139 and AW139 | Airworthiness Directives; Agusta S.p.A. (Agusta) Model AB139 and AW139 Helicopters |
Unsafe Condition
Internal corrosion of the Number 2 Modular Avionic Unit (MAU) circuit card assemblies, which can result from exposure to external moisture via the ventilation duct installation, leading to false indications or misleading data displayed to the flight crew, disengagement of flight director modes, and increased workload that could lead to loss of control.
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Required Actions
Inspect certain modules and related connectors for corrosion. Clean connectors if corrosion is found. Replace modules with airworthy ones if corrosion is present. Modify the Number 2 Modular Avionic Unit (MAU) ventilation duct to reroute airflow away from the MAU2 cabinet and modules.
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Compliance Time
Within 30 hours time-in-service or 1 month, whichever occurs first.
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Affected Aircraft
Agusta S.p.A. Model AB139 and AW139 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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