AD 78-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109 | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109C | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109E | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109K2 | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
Unsafe Condition
Failure of main transmission due to pinion gear P/N 109-0403-06-01 with serial numbers 18, 24, 25, or 27 installed in main transmissions S/N 31, 36, 11, and 10 respectively.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove pinion gear P/N 109-0403-06-01 with serial numbers 18, 24, 25, or 27 from main transmissions S/N 31, 36, 11, and 10 respectively. Replace with new pinion gear of the same part number but with serial numbers other than 17 through 32.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Agusta S.p.A. Model A109 Series helicopters with serial numbers 7107, 7111, 7126, and 7129
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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