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Airworthiness Directive 97-25055

one-time
AD 97-25055 · 1997-09-22 · turboprop engine

Airworthiness Directives; Lockheed Model L-188A and L-188C Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to all Lockheed Model L-188A and L-188C series airplanes. This amendment requires revising the Airplane Flight Manual (AFM) to prohibit the positioning of the power levers below the flight idle stop during flight, and to provide a statement of the consequences of positioning the power levers below flight idle stop. This amendment is prompted by incidents and accidents involving airplanes equipped with turboprop engines where the propeller ground beta was used improperly during flight. The actions specified by this AD are intended to prevent loss of airplane controllability, or engine overspeed and 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 97-25055 applies to

MakesLockheed

equipped with

Whether AD 97-25055 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 97-25055 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.