AD 2009-05-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Model 412, 412CF, and 412EP Helicopters |
| aircraft | Bell | Helicopter Textron Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Model 412, 412CF, and 412EP Helicopters |
Unsafe Condition
Fatigue cracking of a main rotor yoke, failure of a yoke, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Reidentify certain part-numbered main rotor yokes based on installation history, reduce retirement life from 5,000 hours TIS to 4,500 hours TIS, record the reidentified part number and reduced retirement life on the component history card, and replace yokes that have exceeded 4,500 hours TIS before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours TIS for reidentification and record-keeping actions; before further flight for replacement of yokes exceeding 4,500 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Inc. Model 412, 412CF, and 412EP helicopters with specific main rotor yokes (P/N 412-010-101-123, -127, -129, or -133) and a (BHT-412-SI-62) slope landing kit, or yokes P/N 412-010-101-127 or -129 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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