Is AD 2013-08-21 a recurring Airworthiness Directive?

No — AD 2013-08-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2013-08-21 apply to?

AD 2013-08-21 applies to Diamond Aircraft Industries Gmbh — models DA 40 NG, DA 40. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-08-21

one-time

Official AD 2013-08-21 · FR doc 2013-09431 · 2013-05-01 · airframe

Airworthiness Directives; Diamond Aircraft Industries Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for Diamond Aircraft Industries Model DA 40 NG airplanes. 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 chafing between the charge air tubing and the engine firewall that may cause a hole in the charge air tubing, which could result in loss of charged air pressure with consequent loss of engine power and loss of control. We are issuing this AD to require actions to address the unsafe condition on these products.

Which aircraft AD 2013-08-21 applies to

MakesDiamond Aircraft Industries Gmbh

ModelsDA 40 NG, DA 40

Serial-conditional — narrows to serials 40.N001–40.N084.

Also applies to DA 40 NG airplanes, all serial numbers, that have been converted from the Model DA 40 D.

Whether AD 2013-08-21 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 2013-08-21 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.