Is AD 2006-21-11 a recurring Airworthiness Directive?

Yes — AD 2006-21-11 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2006-21-11 apply to?

AD 2006-21-11 applies to Turbomeca — models Turmo IV A, Turmo IV C, Turmo IV. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2006-21-11

recurring

Official AD 2006-21-11 · FR doc E6-17328 · 2006-10-19 · turboshaft engine

Airworthiness Directives; Turbomeca Turmo IV A and IV C Series Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Turbomeca Turmo IV A and IV C series turboshaft engines. This AD requires identifying, inspecting and replacing flexible lubrication pipes manufactured after April 1, 2003. If both engines on the same helicopter each have an affected pipe, then this AD requires replacing one of the affected pipes before further flight. This AD also requires initial and repetitive borescope inspections of affected pipes, visual inspections for oil leakage, and visual inspections of the oil filter, on engines that are not required to have an affected pipe replaced before further flight by this AD. This AD results from 7 reports of oil leakage due to the deterioration of flexible lubrication pipes manufactured after April 1, 2003. We are issuing this AD to prevent dual-engine failure on a twin-engine helicopter.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2006-21-11 applies to

MakesTurbomeca

ModelsTurmo IV A, Turmo IV C, Turmo IV

Part-conditional — 0 249 92 813 0, 0 249 92 916 0.

Applies only when flexible lubrication pipe P/N 0 249 92 813 0 or P/N 0 249 92 916 0 is installed. Installed on, but not limited to, Aerospatiale SA 330-PUMA helicopters.

Whether AD 2006-21-11 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 2006-21-11 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.