Is AD 74-20-02 a recurring Airworthiness Directive?

No — AD 74-20-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 74-20-02 apply to?

AD 74-20-02 applies to Boeing — models 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 74-20-02

one-time

AD 74-20-02 · 1974-01-01 · airframe

Airworthiness Directives; tubing to include a vertical rise just inboard of each pitot-static probe in accordance with Boeing Service Bulletin 737-34-1031,

Which aircraft AD 74-20-02 applies to

MakesBoeing

Models737

Within the next 3500 hours TIS, modify pitot-static tubing to include a vertical rise just inboard of each pitot-static probe per Boeing Service Bulletin 737-34-1031.

Whether AD 74-20-02 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 74-20-02 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.