Is AD 80-25-06 R1 a recurring Airworthiness Directive?

No — AD 80-25-06 R1 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 80-25-06 R1 apply to?

AD 80-25-06 R1 applies to Teledyne Continental Motors — models GTSIO-520-L, GTSIO-520-M, GTSIO-520-N, GTSIO-520. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 80-25-06 R1

one-time

AD 80-25-06 R1 · 1980-01-01 · reciprocating engine

Airworthiness Directives; thrust washer accomplish the following: (a) Before each flight and immediately after each flight until the accumulation of 100 hou

Which aircraft AD 80-25-06 R1 applies to

MakesTeledyne Continental Motors

ModelsGTSIO-520-L, GTSIO-520-M, GTSIO-520-N, GTSIO-520

Concerns thrust washer wear: before and immediately after each flight until 100 hours TIS accumulate, perform a special oil pressure check (pilot-performed check allowed per FAR 43.3(h)); at each oil change, visually and magnetically inspect for metallic contaminants and take corrective action if contamination exceeds a 1/4-inch-diameter equivalent.

Whether AD 80-25-06 R1 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 80-25-06 R1 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.