Is AD 47-42-12 a recurring Airworthiness Directive?

No — AD 47-42-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 47-42-12 apply to?

AD 47-42-12 applies to Douglas, The Boeing Company — models DC-6, DC-6A, DC-6B. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 47-42-12

one-time

AD 47-42-12 · 1947-01-01 · airframe

Airworthiness Directives; DOUGLAS DC-6

Which aircraft AD 47-42-12 applies to

MakesDouglasThe Boeing Company

ModelsDC-6, DC-6A, DC-6B

Serial-conditional — narrows to serials 42866–42866, 42868–42875.

Was Mandatory Note 9 of AD-781-1. Applies to DC-6 Serial Numbers 42866, and 42868 to 42875 inclusive (further requirement text cut off in source). Douglas Service Bulletin DC-6 No. 45 covers the same subject.

Whether AD 47-42-12 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 47-42-12 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 →

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.