AD 2021-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
chafing of a wire in the alternating current (AC) power system cable assembly, due to a protective grommet incorrectly installed in the emergency bus interlock compartment.
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Required Actions
a one-time inspection of the clearance between a protective grommet installed in the emergency bus interlock compartment and the cable assemblies passing through it, and depending on the finding, applicable corrective actions, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The corrective actions include replacing the existing grommet with a new grommet, inspecting the cable assemblies for damage (including chafing) and replacing affected cable assemblies, and reworking the bulkhead in the emergency bus interlock compartment.
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Compliance Time
Before further flight
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Affected Aircraft
Leonardo S.p.a. Model AB412 and AB412 EP helicopters, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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