AD 2007-24-07
Unsafe Condition
A repair shop did not meet the process requirements when applying copper-nickel-indium (Cu-Ni-In) thermal coating to certain stage 1 fan disks, potentially leading to an uncontained release of multiple fan blades.
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Required Actions
Strip the Cu-Ni-In thermal coating from the pressure faces and slot bottoms of the stage 1 fan disk, perform a microstructure evaluation, ultrasonic inspect, fluorescent penetrant inspect, and eddy current inspect the disk, and reapply the Cu-Ni-In thermal coating.
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Compliance Time
Within 3,500 cycles-since-last Cu-Ni-In thermal spray coating of the dovetail slots, but no later than March 31, 2008.
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Affected Aircraft
GE CF6-80C2B1 turbofan engine, serial number 690203, with fan disk, part number (P/N) 1703M78P11, SN RPMDA662, installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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