AD 70-14-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Model 206A Helicopters |
Unsafe Condition
Failure of the existing firewall-to-compressor seal could result in engine compressor flange loads that may lead to seal failure and subsequent engine failure.
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Required Actions
Replace existing firewall-to-compressor seal with Bell Part No. 206-704-026-1 in accordance with Bell Service Letter 206A-142. Equivalent methods require FAA approval.
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Compliance Time
not later than 300 hours time in service after the effective date of this Airworthiness Directive
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Affected Aircraft
Bell Helicopter Textron Canada Limited Model 206A Helicopters with serial numbers 4 thru 448, 460 thru 464, 467, 469 thru 473, and 475 thru 477
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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