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Airworthiness Directive 2006-21-10

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Official AD 2006-21-10 · FR doc E6-17326 · 2006-10-19 · turboshaft engine

Airworthiness Directives; Turbomeca Arriel 2B Series Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Turbomeca Arriel 2B, 2B1, and 2B1A turboshaft engines. This AD requires visually inspecting the splines of the high-pressure (HP) pump drive gear shaft and coupling shaft assembly for wear. This AD results from reports of uncommanded in-flight shutdowns of engines. We are issuing this AD to detect wear on the splines of the HP pump drive gear shaft and coupling shaft assembly, which could interrupt the fuel flow and cause an uncommanded in-flight shutdown of the engine on a single- engine helicopter. The in-flight shutdown of the engine could result in a forced autorotation landing or accident.

Which aircraft AD 2006-21-10 applies to

MakesTurbomeca
ModelsArriel 2B, Arriel 2B1, Arriel 2B1A, Arriel 2

Installed on, but not limited to, Eurocopter AS350B3 and EC130B4 helicopters. Addresses wear on splines of the high-pressure (HP) pump drive gear shaft and coupling shaft assembly.

Whether AD 2006-21-10 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 2006-21-10 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.