Is AD 2011-23-01 a recurring Airworthiness Directive?

No — AD 2011-23-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2011-23-01 apply to?

AD 2011-23-01 applies to Thielert Aircraft Engines Gmbh — models TAE 125-01, TAE 125-02-99, TAE 125. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2011-23-01

one-time

Official AD 2011-23-01 · FR doc 2011-28672 · 2011-11-07 · reciprocating engine

Airworthiness Directives; Thielert Aircraft Engines GmbH (TAE) Reciprocating Engines

What this AD requires

We are superseding an existing airworthiness directive (AD) for Thielert Aircraft Engines GmbH (TAE) Models TAE 125-01 and TAE 125- 02-99 reciprocating engines. That AD currently requires replacement of certain part numbers (P/Ns) and serial numbers (S/Ns) of clutch assemblies due to clutch failure. The failures identified above could lead to engine in-flight shutdown and loss of control of the airplane. This AD requires the same actions, but applies the corrective action to an additional 244 affected clutch assemblies. This AD was prompted by TAE identifying additional clutch assemblies with nonconforming disc springs. We are issuing this AD to correct the unsafe condition on these products.

Which aircraft AD 2011-23-01 applies to

MakesThielert Aircraft Engines Gmbh

ModelsTAE 125-01, TAE 125-02-99, TAE 125

Part-conditional — 02-7210-11001R13, 05-7211-K006001, 05-7211-K006002.

Applies to TAE 125-01 engines (Centurion 1.7, all S/Ns) only if clutch assembly P/N 02-7210-11001R13 is installed, and to TAE 125-02-99 engines (Centurion 2.0, all S/Ns) only if clutch assembly P/N 05-7211-K006001 or 05-7211-K006002 is installed.

Whether AD 2011-23-01 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 2011-23-01 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.