AD 2012-23-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. | Airworthiness Directives; Agusta S.p.A. Helicopters |
Unsafe Condition
Damage to the main drive shaft caused by improperly secured metallic spacers on some A109 model helicopters, which could lead to failure of the main drive shaft and subsequent loss of helicopter control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the lower semichannel assemblies to determine if metallic spacers are installed. If metallic spacers are installed, inspect for correct installation of the metallic spacers and correct seating of the gaskets. If metallic spacers are not installed with rivets, modify the lower semichannel assemblies and inspect the main drive shaft for damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 hours time-in-service after the effective date of this AD.
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Affected Aircraft
Agusta S.p.A. Model A109E helicopters, up to and including serial number 11694, except 11633 and 11634; and Model A109S helicopters, up to and including serial number 22034, except 22026 and 22033; with lower semichannel assemblies, part number 109-0641-10-213 or 109-0642-01-171, 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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