Is AD 2017-20-12 a recurring Airworthiness Directive?

No — AD 2017-20-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2017-20-12 apply to?

AD 2017-20-12 applies to Boeing — models 737-100, 737-200, 737-200C, 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2017-20-12

one-time

Official AD 2017-20-12 · FR doc 2017-21445 · 2017-10-12 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, and -200C series airplanes. This AD was prompted by a report of incidents involving fatigue cracking in transport category airplanes that are approaching or have exceeded their design service objective and a structural reevaluation that was conducted by the manufacturer. This AD requires revising the maintenance or inspection program, as applicable, to add supplemental inspections. This AD also requires inspections to detect cracks in each structural significant item (SSI), and repair of any cracked structure. We are issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2017-20-12 applies to

MakesBoeing

Models737-100, 737-200, 737-200C, 737

Whether AD 2017-20-12 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 2017-20-12 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.