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Airworthiness Directive 97-05-12

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Official AD 97-05-12 · FR doc 97-7595 · 1997-03-31 · turboprop engine

Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Aircraft Engines (GE) CT7 series turboprop engines. This action requires eddy current inspection of disk holes of stage 1 and 2 gas generator turbine (GGT) disks for cracks, and, if necessary, replacement with serviceable parts. This amendment is prompted by a report of a stage 2 GGT disk failure. The actions specified in this AD are intended to prevent a stage 1 or 2 GGT disk failure, which could result in an uncontained engine failure and damage to the aircraft.

Which aircraft AD 97-05-12 applies to

MakesGeneral Electric
ModelsCT7-5A2, CT7-7A, CT7-9B, CT7-9C, CT7

Whether AD 97-05-12 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 97-05-12 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.