Airworthiness Directive 64-28-01
one-timeAD 64-28-01 · 1964-01-01 · propeller
Airworthiness Directives; Hub Spiders Having Serial Numbers 4220 through 5400 Installed on Downer (Republic) RC-3; Navion, Navion A; and Grumman G-44 Series
Which aircraft AD 64-28-01 applies to
MakesHub Spiders Having Serial Numbers 4220 Through 5400 Installed On Downer Rc-3 Navion Navion A And Grumman G-44
ModelsG-44
Serial-conditional — narrows to serials 4220–5400, 4220–5400.
Whether AD 64-28-01 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 64-28-01 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.