AD 79-19-07 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; Costruzioni Aeronautiche Giovanni Agusta Model A109A Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; Costruzioni Aeronautiche Giovanni Agusta Model A109A Helicopters |
Unsafe Condition
Tail rotor gearbox mounting failure due to cracks, fretting, nicks, or wear in the attach sleeve and shim (P/N 109-0435-29-3 and P/N 109-0372-18-5).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect tail rotor gearbox attach nutplates for condition and security, replace defective nutplates. Inspect sleeve and shim for cracks, fretting, nicks, and wear. Replace cracked or worn parts with serviceable parts of same P/N or specified alternatives. Correct alignment and coaxiality between sleeve and tail boom per service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 100 hours' time in service since the previous inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Costruzioni Aeronautiche Giovanni Agusta Model A109A helicopters equipped with 90 degree gearbox attach sleeve, P/N 109-0435-29-3
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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