Is AD 91-03-01 a recurring Airworthiness Directive?

No — AD 91-03-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 91-03-01 apply to?

AD 91-03-01 applies to Boeing Helicopters (Boeing Vertol Helicopter Co.) — models 234. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 91-03-01

one-time

AD 91-03-01 · 1991-01-01 · airframe

Airworthiness Directives; on February 14, 1991. FOOTER: Columbia Helicopters, Inc. 234 Columbia Helicopters, Inc.\234 This information is not available. 90-

Which aircraft AD 91-03-01 applies to

MakesBoeing Helicopters (Boeing Vertol Helicopter Co.)

Models234

Effective February 14, 1991. Docket No. 90-ASW-47-AD. Applies to Model 234 series helicopters (Columbia Helicopters, Inc. operator reference in source record).

Whether AD 91-03-01 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 91-03-01 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.