Is AD C1-2010-21870 a recurring Airworthiness Directive?

No — AD C1-2010-21870 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD C1-2010-21870 apply to?

AD C1-2010-21870 applies to Thielert, Tae, Thielert Aircraft Engines — models TAE 125-01, TAE 125-02-99, TAE 125. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive C1-2010-21870

one-time

AD C1-2010-21870 · 2010-09-02 · reciprocating engine

Airworthiness Directives; Thielert Aircraft Engines GmbH (TAE) Models TAE 125-01 and TAE 125-02-99 Reciprocating Engines Installed In, But Not Limited To, Diamond Aircraft Industries Model DA 42 Airplanes; Correction

What this AD requires

The FAA is correcting airworthiness directive (AD) 2010-11-09, which published in the Federal Register. That AD applies to TAE models TAE 125-01 and TAE 125-02-99 reciprocating engines, installed in, but not limited to, Diamond Aircraft Industries model DA 42 airplanes. The part number for engine model TAE 125-01 is missing a digit in paragraph (c) and in paragraph (e)(3). This document corrects those part numbers. In all other respects, the original document remains the same.

Which aircraft AD C1-2010-21870 applies to

MakesThielertTaeThielert Aircraft Engines

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

Thielert TAE 125-01 / TAE 125-02-99 diesel engines (e.g. Diamond DA42) — confirm exact model / part number from records

Whether AD C1-2010-21870 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 C1-2010-21870 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.