AD 97-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109K2 | Airworthiness Directives; Agusta S.p.A Model A109K2 Helicopters |
Unsafe Condition
Fatigue cracks in the main transmission Gleason crown could lead to failure of the Gleason crown, failure of the main transmission, and subsequent loss of control of the helicopter.
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Required Actions
Within 50 hours time-in-service (TIS) after the effective date and thereafter every 300 hours TIS, inspect the Gleason crown (P/N 109-0403-07) for cracks using magnetic particle inspection per Agusta Technical Bulletin 109K-16. If cracks are found, replace the crown with an airworthy part (P/N 109-0403-07-103, S/N B58264-B58270 or B58272+) and vibro-etch the main transmission tag with 'S.M. 109-25094'.
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Compliance Time
Within 50 hours time-in-service (TIS) after the effective date of this AD, and thereafter at intervals not to exceed 300 hours TIS.
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Affected Aircraft
Agusta S.p.A Model A109K2 helicopters with main transmission assembly P/N 109-0400-03, serial numbers 005, 006, 007, 008, 010, 011, 012, 013, 014, 015, 016, 017, 018, 020, 022, 024, 027, 030, 031, 032, 033, 034, 035, 038, 039, 042, 047, 048, A2/1053, A2/1073, A2/1397, B54895, or C347.
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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