Is AD 81-21-02 R1 a recurring Airworthiness Directive?

No — AD 81-21-02 R1 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 81-21-02 R1 apply to?

AD 81-21-02 R1 applies to Aerostar International — models RX-6, RX-7, S-40A, S-50A, S-55A, S-60A, S-66A, W100LB. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 81-21-02 R1

one-time

AD 81-21-02 R1 · 1981-01-01 · airframe

Airworthiness Directives; March 8, 1984. FOOTER: Aerostar International RX-6 RX-7 S-40A S-50A S-55A S-60A S-66A W100LB Aerostar International\RX-6 Aerostar

Which aircraft AD 81-21-02 R1 applies to

MakesAerostar International

ModelsRX-6, RX-7, S-40A, S-50A, S-55A, S-60A, S-66A, W100LB

Effective March 8, 1984; full regulatory text not available in source.

Whether AD 81-21-02 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 81-21-02 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.