AD 97-07-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 412 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 Helicopters |
Unsafe Condition
Cracking and in-service failures of the steel main rotor control swashplate support assembly (P/N 412-010-453-101) could result in loss of main rotor control and subsequent loss of control of the helicopter.
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Required Actions
Before further flight after the effective date, inspect the steel swashplate support assembly daily with an inspection mirror and bright light. Install a red radial arc on each airspeed indicator and a placard stating 'VNE not to exceed 110 KIAS or VNE from the airspeed limitation placard, whichever is less.' Replace the assembly if a crack is found. Installing an improved steel (P/N 412-010-453-105) or aluminum (P/N 412-010-443-101/-109) swashplate support assembly terminates AD requirements.
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Compliance Time
Before further flight after the effective date of this AD
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412 helicopters with steel main rotor control swashplate support assembly (P/N 412-010-453-101) installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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