AD 2006-21-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | Arriel 2B Series | Airworthiness Directives; Turbomeca Arriel 2B Series Turboshaft Engines |
Unsafe Condition
Wear on the splines of the high-pressure (HP) pump drive gear shaft and coupling shaft assembly could interrupt the fuel flow and cause an uncommanded in-flight shutdown of the engine on a single-engine helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the splines of the coupling assembly and the HP pump drive gear shaft for wear. Replace the HMU if worn beyond limits. Perform repetitive inspections every time the HMU is removed or installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours after the effective date for HMUs with 450 or more hours TSN/TSO, or after accumulating 450 hours TSN/TSO but before 500 hours for HMUs with fewer than 450 hours TSN/TSO.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 2B, 2B1, and 2B1A turboshaft engines installed on, but not limited to, Eurocopter AS350B3 and EC130B4 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.