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Airworthiness Directive 93-31908

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AD 93-31908 · 1994-01-03 · turboprop engine

Airworthiness Directives; General Electric CT7 Series Turboprop and Turboshaft Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to General Electric (GE) CT7 series turboprop and turboshaft engines. This proposal would require the removal from service of certain gas generator turbine (GGT) rotor assembly parts that were plasma-sprayed during manufacture. This amendment is prompted by material testing that indicates that the plasma-spray process reduces the low cycle fatigue (LCF) capability of the material. The actions specified by this AD are intended to prevent fatigue cracks that can result in uncontained engine failure.

Which aircraft AD 93-31908 applies to

MakesGeneral Electric
ModelsCT7-5A2, CT7-7A, CT7-9C, CT7-2A, CT7-6, CT7

Covers both turboprop engines (CT7-5A2, -7A, -9C) and turboshaft engines (CT7-2A, -6); applies to engines incorporating gas generator turbine (GGT) disks and cooling plates listed by part number and serial number in GE CT7 Turboprop SB A72-252 (dated Aug 31, 1990) and GE CT7 Turboshaft SBs A72-17 and A72-18 (both dated Sept 10, 1990). Installed on but not limited to Saab 340A, Casa CN235-10, Bell 214ST, and European Helicopter Industries EH101.

Whether AD 93-31908 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 93-31908 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.