AD 2018-16-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Finmeccanica S.p.A. | Various | Airworthiness Directives; Leonardo S.p.A. Helicopters (Type Certificate Previously Held By Finmeccanica S.p.A., AgustaWestland S.p.A) |
Unsafe Condition
Degraded bearings on the engine and transmission oil cooling system pulley assembly, part number (P/N) 109G6320L01-101, can cause engine power loss, transmission failure, and loss of control of the helicopter.
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Required Actions
Inspecting each bearing with a borescope for a crack, position of the grease shield, and leaking grease. If there is a crack or leaking grease, replace each fan assembly with fan assembly P/N 109-0455-01-101 before further flight. Inspect each bearing for axial and radial play and freedom of rotation. If there is any axial or radial play, rotation resistance, or binding, replace each fan assembly with fan assembly P/N 109-0455-01-101 before further flight. If there is no play, no rotation resistance, and no binding, replace each fan assembly with fan assembly P/N 109-0455-01-101 within 20 hours TIS. Prohibit installing fan assembly P/N 109-0455-01-103 on any helicopter.
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Compliance Time
Within 5 hours time-in-service (TIS)
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Affected Aircraft
Leonardo S.p.A. Model A109E, A109S, and AW109SP helicopters with an oil cooler fan assembly (fan assembly) installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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