Is AD 75-12-09 R2 a recurring Airworthiness Directive?

No — AD 75-12-09 R2 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 75-12-09 R2 apply to?

AD 75-12-09 R2 applies to Twin Commander Aircraft Llc — models 500, 500-A, 500-B, 500-S, 500-U, 520, 560, 560-A. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 75-12-09 R2

one-time

AD 75-12-09 R2 · 1975-01-01 · airframe

Airworthiness Directives; November 28, 1981. FOOTER: Twin Commander Aircraft LLC 500 500-A 500-B 500-S 500-U 520 560 560-A 560-E 560-F 680 680-E 680-F 680-F

Which aircraft AD 75-12-09 R2 applies to

MakesTwin Commander Aircraft Llc

Models500, 500-A, 500-B, 500-S, 500-U, 520, 560, 560-A, 560-E, 560-F, 680, 680-E, 680-F, 680-F(P), 720

Amendment effective November 28, 1981, per footer model list (Twin Commander Aircraft LLC type-certificate holder).

Whether AD 75-12-09 R2 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 75-12-09 R2 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.