AD 85-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 412 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 412 Helicopters |
Unsafe Condition
Cracks in the main rotor pitch horn assembly P/N 412-010-149-105 and main rotor pins P/N 412-010-180-101 could lead to pitch horn failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect main rotor pitch horn assembly for cracks within 20 hours time in service after AD effective date, and repeat every 20 hours. Magnetic particle inspect pitch horn if removed. Replace cracked parts and inspect spindle joint before installation. Install newer parts P/N 412-010-149-111 and P/N 412-010-180-103 to avoid further inspections.
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Compliance Time
Within the next 20 hours time in service after the effective date of this AD and thereafter at intervals not to exceed 20 hours time in service from the last inspection
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412 helicopters, serial numbers 33001 through 33110, equipped with main rotor pitch horn assembly P/N 412-010-149-105 and main rotor pins P/N 412-010-180-101.
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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