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Airworthiness Directive 98-22-06

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Official AD 98-22-06 · FR doc 98-28535 · 1998-10-28 · turbine engine

Airworthiness Directives; General Electric Company CF6-6, -45, - 50, -80A, and -80C2 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company CF6-6, -45, -50, -80A, and - 80C2 series turbofan engines. This action requires, prior to further flight, an ultrasonic immersion inspection for cracks in stage 1 fan disks, and, if necessary, replacement with serviceable parts. This amendment is prompted by reports of cracked fan disks found during routine shop inspections on fan disks manufactured between late 1984/ early 1985. The actions specified in this AD are intended to prevent fan disk failure due to cracks, which could result in an uncontained engine failure and damage to the aircraft.

Which aircraft AD 98-22-06 applies to

MakesGeneral Electric
ModelsCF6-6, CF6-45, CF6-50, CF6-80A, CF6-80C2, CF6

Applies to engines with stage 1 fan disks installed, identified by serial number in GE Alert Service Bulletins CF6-6 ASB72-A996 Rev.4, CF6-50 ASB72-A988 Rev.6, CF6-80A ASB72-A565 Rev.5, and CF6-80C2 ASB72-A478 Rev.4.

Whether AD 98-22-06 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 98-22-06 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.