Is AD 2013-21329 a recurring Airworthiness Directive?

No — AD 2013-21329 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2013-21329 apply to?

AD 2013-21329 applies to Rotax — models 912 A, 912 A2, 912 A3, 912. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-21329

one-time

AD 2013-21329 · 2013-09-04 · reciprocating engine

Airworthiness Directives; Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engine

What this AD requires

We are adopting a new airworthiness directive (AD) for various aircraft equipped with Rotax Aircraft Engines 912 A Series Engine. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as oil leaks in the intake channel in the area of the valve guide on some cylinder heads could increase the oil consumption and result in engine stoppage. We are issuing this AD to require actions to address the unsafe condition on these products.

Which aircraft AD 2013-21329 applies to

MakesRotax

Models912 A, 912 A2, 912 A3, 912

Part-conditional — 623682.

Applies only to the listed airplane models when the Rotax 912 A series engine has cylinder head assembly (2/3) P/N 623682 installed.

Whether AD 2013-21329 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 2013-21329 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.