Is AD 68-04-02 a recurring Airworthiness Directive?

No — AD 68-04-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 68-04-02 apply to?

AD 68-04-02 applies to Bell Helicopter Textron Canada. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 68-04-02

one-time

AD 68-04-02 · 1968-01-01 · airframe

Airworthiness Directives; ducts to the engine exhaust flanges, accomplish the following modification: Replace exhaust stack clamp as follows: Remove clamps,

Which aircraft AD 68-04-02 applies to

MakesBell Helicopter Textron Canada

Part-conditional — N3657, 4656AA, MS20995C32.

applicability read from the AD teaser — confirm exact model/serial from the records

Whether AD 68-04-02 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 68-04-02 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.

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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.