Is AD 2006-23-17 a recurring Airworthiness Directive?

No — AD 2006-23-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2006-23-17 apply to?

AD 2006-23-17 applies to Turbomeca — models Turmo IV A, Turmo IV C, Turmo IV. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2006-23-17

one-time

Official AD 2006-23-17 · FR doc E6-19274 · 2006-11-16 · turboshaft engine

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

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for Turbomeca Turmo IV A and IV C series turboshaft engines. That AD currently requires borescope and eddy current inspections or ultrasonic inspections of centrifugal compressor intake wheel blades for cracks and evidence of corrosion pitting, and replacement with serviceable parts. This AD requires the same actions, but would require borescope inspections at more frequent intervals for certain engines. This AD results from Turbomeca's review of the engines' service experience that determined more frequent borescope inspections are required on engines not modified to the TU 191, TU 197, or TU 224 standard. We are issuing this AD to prevent centrifugal compressor intake wheel blade cracks, which can result in engine in-flight power loss, engine shutdown, or forced landing.

Which aircraft AD 2006-23-17 applies to

MakesTurbomeca

ModelsTurmo IV A, Turmo IV C, Turmo IV

Applicability notes more frequent borescope inspections for engines not modified to the TU 191, TU 197, or TU 224 standard.

Whether AD 2006-23-17 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 2006-23-17 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.