AD 82-26-51 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 412 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 412 Helicopters |
Unsafe Condition
Failure of the main rotor yoke assemblies P/N 412-010-101-109, -113, -117, and -121 due to fatigue.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Reduce retirement life of yoke assemblies P/N 412-010-101-113, -117, and -121 to 700 hours time in service. Install flex indicator kit Bell P/N 412-703-006-101 within 25 hours time in service after AD effective date. Perform daily visual inspections of yoke assemblies and inspect flex indicators before first flight each day. Corrective action required if deflection is indicated per Bell Alert Service Bulletin 412-82-9 or approved equivalent.
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Compliance Time
Effective December 2, 1983. Compliance required immediately for retirement life reduction; flex indicator installation within 25 hours time in service after effective date; daily inspections before first flight each day.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412 helicopters with main rotor yokes P/N 412-010-101-109, -113, -117, and -121.
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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