AD Amdt-39-10252
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model A109K2 | Airworthiness Directives; Agusta S.p.A. Model A109K2 Helicopters |
Unsafe Condition
Fatigue cracks in the Gleason crown on the main transmission can lead to failure of the Gleason crown, failure of the main transmission, and subsequent loss of control of the helicopter.
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Required Actions
Inspect the main transmission Gleason crown for cracks via magnetic particle inspection within 50 hours time-in-service and every 300 hours thereafter. Replace the crown with an airworthy part (P/N 109-0403-07-103, S/N B58264-B58270 or B58272+) if cracks are found. Vibro-etch the main transmission tag with 'S.M. 109-25094' after replacement.
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Compliance Time
Within 50 hours time-in-service after the effective date
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Affected Aircraft
Agusta Model A109K2 helicopters with main transmission assembly P/N 109-0400-03 and specified serial numbers (005, 006, etc.)
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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