Is AD 90-02-23 PL a recurring Airworthiness Directive?

No — AD 90-02-23 PL is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 90-02-23 PL

Q: Which aircraft does AD 90-02-23 PL apply to?

AD 90-02-23 PL applies to Christen (Pitts), Great Lakes, Moravan, Piper, Socata — models Pitts S-1T, Pitts S-2, Pitts S-2A, Pitts S-2S, Pitts S-2B, Great Lakes 2T-1A-1, Great Lakes 2T-1A-2, Moravan Zlin 526L. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 90-02-23 PL · 1990-01-01 · airframe

Airworthiness Directives; Pitts S-1T, S-2, S-2A, S-2S, S-2B Great Lakes 2T-1A-1, 2T-1A-2 Moravan Zlin 526L Piper Cherokee Six, Saratoga, Lance PA-32(R,T)-30

Which aircraft AD 90-02-23 PL applies to

MakesChristen (Pitts)Great LakesMoravan Piper Socata

ModelsPitts S-1T, Pitts S-2, Pitts S-2A, Pitts S-2S, Pitts S-2B, Great Lakes 2T-1A-1, Great Lakes 2T-1A-2, Moravan Zlin 526L, Piper Cherokee Six, Piper Saratoga, Piper Lance, PA-32(R,T)-300(T), PA-32S-300, PA-32(R)-301(T), Socata TB30, PA-32

Multi-make/model applicability list (list format suggests a propeller or common-equipment AD spanning several manufacturers); source text is truncated with a duplicated passage and a possible additional 'Scottish Aviation' entry not fully captured.

Whether AD 90-02-23 PL 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 90-02-23 PL 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.