AD 2007-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 2B1 Turboshaft Engines |
| engine | Turbomeca | Arriel 2B1 | Airworthiness Directives; Turbomeca Arriel 2B1 Turboshaft Engines |
Unsafe Condition
Two cases of flameout have been reported on Arriel 2B1 engines: One when lowering collective pitch on ground at landing and one when switching from Flight Position to idle Position on ground. Both flameout events are explained as occurring when the stepper motor loses steps to a value below the 'level 1 failure' detection threshold, reducing the fuel flow of the anti-flameout limit sufficiently to cause an engine flameout when decreasing rapidly the demand for power.
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Required Actions
Download and install DECU software version 5.02 as soon as practicable, but no later than August 31, 2007.
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Compliance Time
Within 3 months of the effective date (August 31, 2007)
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Affected Aircraft
Turbomeca Arriel 2B1 Turboshaft Engines
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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