AD 99-13-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206L-4 | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 206L-4 Helicopters |
Unsafe Condition
Defective hydraulic relief valve (part number 206-076-036-101) causing intermittent hydraulic pressure in the flight controls and subsequent loss of control.
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Required Actions
Replace hydraulic relief valve part number 206-076-036-101 with improved part number 206-076-036-105 per Bell Helicopter Textron Alert Service Bulletin 206L-98-111. Submit alternative compliance requests through FAA Principal Maintenance Inspector.
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Compliance Time
Within 300 hours time-in-service
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Affected Aircraft
Bell Helicopter Textron Canada Model 206L-4 helicopters, serial numbers 52001 through 52208
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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