Airworthiness Directive 98-18-10
one-timeAirworthiness Directives; General Electric Company CF6-6 Series Turbofan Engines
What this AD requires
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-6 series turbofan engines, that requires removal from service of affected low pressure turbine (LPT) stage 4 disks prior to reaching new, reduced cyclic life limits, and replacement with serviceable parts. This amendment is prompted by reports of LPT stage 4 disk cracking in the blade dovetail slot bottom area. The actions specified by this AD are intended to prevent LPT stage 4 disk cracking, which could result in an uncontained engine failure and damage to the aircraft.
Which aircraft AD 98-18-10 applies to
Installed on but not limited to McDonnell Douglas DC-10-10 series aircraft; applies to each identified engine regardless of modification, alteration, or repair status.
Whether AD 98-18-10 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:
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.