Is AD 97-22-08 a recurring Airworthiness Directive?

No — AD 97-22-08 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 97-22-08 apply to?

AD 97-22-08 applies to Pilatus — models PC-6 B1, PC-6 B2, PC-6, PC-12. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 97-22-08

one-time

Official AD 97-22-08 · FR doc 97-28578 · 1997-10-29 · turboprop engine

Airworthiness Directives; Pilatus Aircraft LTD Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4, and PC-12 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft LTD (Pilatus) Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4 airplanes and all Pilatus Model PC-12 airplanes. This AD requires amending the Limitations Section of either the airplane flight manual (AFM) or the pilot's operating handbook (POH) to prohibit the positioning of the power levers below the flight idle stop while the airplane is in flight. This AFM amendment will include a statement of consequences if the limitation is not followed. This AD results from numerous incidents and five documented accidents involving airplanes equipped with turboprop engines where the propeller beta was improperly utilized during flight. The actions specified by this AD are intended to prevent loss of airplane control or engine overspeed with consequent loss of engine power caused by the power levers being positioned below the flight idle stop while the airplane is in flight.

Which aircraft AD 97-22-08 applies to

MakesPilatus

ModelsPC-6 B1, PC-6 B2, PC-6, PC-12

Requires an Airplane Flight Manual (PC-6 B1/B2) or Pilot's Operating Handbook (PC-12) limitation prohibiting positioning power levers below the flight idle stop in flight, per Pilatus Temporary Revisions dated November 1996, to prevent loss of control or engine overspeed.

Whether AD 97-22-08 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 97-22-08 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 →Read the full directive (Federal Register)

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.