AD 2014-11-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A | Airworthiness Directives; Agusta S.p.A Helicopters (Type Certificate Currently Held by AgustaWestland S.p.A) (Agusta) |
Unsafe Condition
Cracked main rotor swashplate support nuts, part number MS21042-4, due to hydrogen embrittlement from a production deficiency at the nut manufacturer, could lead to failure of the main rotor system and subsequent loss of control of the helicopter.
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Required Actions
Inspect each nut, P/N MS21042-4, connecting the swashplate support to the upper case of the main transmission for cracks within 10 hours time-in-service (TIS). Replace any cracked nut immediately. Replace all nuts, P/N MS21042-4, within 25 hours TIS, even if not cracked. Prohibit installing P/N MS21042-4 nuts for this connection on any helicopter.
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Compliance Time
Within 10 hours TIS for inspection, and within 25 hours TIS for replacement of all nuts.
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Affected Aircraft
Agusta Model A109A, A109A II, A109C, A109E, A109K2, A109S, AW109SP, A119, and AW119 MKII helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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