Is AD 2017-09-12 a recurring Airworthiness Directive?

No — AD 2017-09-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2017-09-12 apply to?

AD 2017-09-12 applies to Atr — models ATR42-500, ATR72-102, ATR72-202, ATR72-212, ATR72-212A, ATR42, ATR72. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2017-09-12

one-time

Official AD 2017-09-12 · FR doc 2017-10258 · 2017-05-23 · airframe

Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain ATR-GIE Avions de Transport R[eacute]gional Model ATR42-500 airplanes and Model ATR72-102, -202, -212, and -212A airplanes. This AD was prompted by reports of failure of emergency power supply units (EPSUs) in production and in service. This AD requires an inspection to determine the part number and serial number of each EPSU, and replacement if necessary. We are issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2017-09-12 applies to

MakesAtr

ModelsATR42-500, ATR72-102, ATR72-202, ATR72-212, ATR72-212A, ATR42, ATR72

ATR42-500: applies to all manufacturer serial numbers except those on which ATR Modification 6780 has been embodied in production. ATR72-102/-202/-212/-212A: applies only to MSNs on which ATR Modification 3715 has been embodied in production, except those on which ATR Modification 6780 has been embodied in production.

Whether AD 2017-09-12 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 2017-09-12 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.