Is AD 86-20-04 a recurring Airworthiness Directive?

No — AD 86-20-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 86-20-04 apply to?

AD 86-20-04 applies to Arctic Aircraft Company — models S-1B2, Interstate. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 86-20-04

one-time

AD 86-20-04 · 1986-01-01 · airframe

Airworthiness Directives; ARCTIC AIRCRAFT COMPANY Model Interstate S-1B2 "Tern" Airplanes

Which aircraft AD 86-20-04 applies to

MakesArctic Aircraft Company

ModelsS-1B2, Interstate

Serial-conditional — narrows to serials 1001–?.

Arctic Aircraft Company Model Interstate S-1B2 "Tern" airplanes, effective October 12, 1986; requires replacing existing AFM with FAA-approved AFM Revision 7 (dated April 15, year truncated in source text).

Whether AD 86-20-04 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 86-20-04 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 →

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.