AD 2004-15-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model A109K2 | Airworthiness Directives; Agusta S.p.A. Model A109K2 Helicopters |
Unsafe Condition
Fatigue failure of the tail rotor trunnion assembly, part number 109-0131-05, leading to separation of the tail rotor hub and blade assembly, and subsequent loss of control of the helicopter.
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Required Actions
Dye-penetrant inspect the trunnion assembly for cracks at specified intervals based on time-in-service (TIS). Replace any cracked trunnion with an airworthy one before further flight. Report any cracked trunnion to the specified FAA contact.
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Compliance Time
Within 10 hours TIS for helicopters with 150 or more hours TIS; at 150 hours TIS for those with less than 150 hours TIS; and thereafter at intervals not exceeding 150 hours TIS.
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Affected Aircraft
Agusta S.p.A. Model A109K2 helicopters with tail rotor trunnion assembly, part number 109-0131-05 (all dash numbers), installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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