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Airworthiness Directive 57-08-04

one-time
AD 57-08-04 · 1957-01-01 · propeller

Airworthiness Directives; pin P/N A-872-1 a maximum of two threads. 3. Peen projecting end of screw to prevent screw from backing out of link pin. 4. Replac

Which aircraft AD 57-08-04 applies to

MakesHartzell
ModelsHC-83X20-1, HC-83X20-2, HC-83XF-1, HC-83XF-2, HC-83XF-3, HC-83XK-1, HC-83XK-2, HC-93Z20-1
Part-conditional — A-872-1.

Replace safety link and link pin assembly in the piston; pin P/N A-872-1 engaged a maximum of two threads; peen projecting end of screw to prevent screw from backing out of link pin; per Hartzell Service Bulletin No. 46, instructions dated April 12, 1957.

Whether AD 57-08-04 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 57-08-04 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.

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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.