AD 2005-13-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model AB412 Series | Airworthiness Directives; Agusta S.p.A. Model AB412 Series Helicopters |
Unsafe Condition
In-flight loss of tail rotor blade forward tip weight retention block (tip block) and/or aft tip closure (tip closure) due to adhesive bond voids or incorrect installation of countersunk screws, potentially leading to blade loss and subsequent loss of helicopter control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect each affected tail rotor blade tip block and tip closure for adhesive bond voids; remove any blade with excessive voids from service; inspect tip block attachment countersink screws for proper flush installation; install shear pins if screws are improperly set; install tip closure rivets on all affected blades.
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Compliance Time
Within 100 hours time-in-service (TIS)
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Affected Aircraft
Agusta S.p.A. Model AB412 Series helicopters, including AB205A1, AB212, and AB412 models, with tail rotor blades part number 212-010-750-ALL and tip block part number 212-010-750-105.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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