Is AD 59-26-01 a recurring Airworthiness Directive?

No — AD 59-26-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 59-26-01 apply to?

AD 59-26-01 applies to Hartzell. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 59-26-01

one-time

AD 59-26-01 · 1959-01-01 · propeller

Airworthiness Directives; -12X20 Propellers With Serial Numbers As Indicated Below. These Propellers May Be Installed On Such Aircraft Models As Downer (Rep

Which aircraft AD 59-26-01 applies to

MakesHartzell

Part-conditional — -12X20.

Applies to Hartzell propellers (partial part number '-12X20' per retrieved text) with serial numbers as indicated in the AD; may be installed on Downer (Republic) RC-3, Grumman G-44, and Navion Series aircraft. Compliance required not later than March 1, 1960; remove affected propellers from service to preclude possible failures.

Whether AD 59-26-01 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 59-26-01 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.