AD Amdt-39-14423
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius Models 2B, 2B1, and 2F Turboshaft Engines |
Unsafe Condition
Blockage of the fuel injection manifolds could lead to engine flameout during rapid deceleration or the inability to maintain the 2.5 minutes one engine inoperative (OEI) rating, and could also cause air path cracks.
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Required Actions
Replace injector manifolds and borescope-inspect the flame tube and high pressure turbine area. Initial replacement must be done within 30 days after the effective date or prior to exceeding 200 hours time-in-service (TIS), whichever is later. Repetitive replacements are required at intervals of 200 hours TIS for Arrius 2B and 2B1 engines, and 400 hours TIS for Arrius 2F engines. Injector manifolds must also be replaced before further flight if a power check shows negative turbine outlet temperature (TOT) margin or negative T4 margin.
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Compliance Time
Within 30 days after the effective date or prior to exceeding 200 hours TIS, whichever is later, for initial replacement. Repetitive replacements are due at intervals of 200 hours TIS for Arrius 2B and 2B1 engines, and 400 hours TIS for Arrius 2F engines.
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Affected Aircraft
Turbomeca S.A. Arrius Models 2B, 2B1, and 2F turboshaft engines installed on but not limited to Eurocopter France Model EC120B and Eurocopter Deutschland EC135 T1 rotorcraft.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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