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AD/CF6/69 - Fan Disk Coating
General Electric Turbine Engines - CF6 SGeneral Electric Turbine Engines - CF6 Series
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General Electric Turbine Engines - CF6 Series
| AD/CF6/69 | Fan Disk Coating | 3/2008 |
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| Applicability: | GE CF6-80C2B1 turbofan engine, serial number (S/N) 690203, with fan disk, part number (P/N) 1703M78P11, S/N RPMDA662, installed.Note 1: This engine is installed on, but not limited to, a Boeing 747-300 aeroplane. |
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| Requirement: | 1. Strip the Copper-Nickel-Indium (Cu-Ni-In) thermal coating from the pressure faces and slot bottoms of the stage 1 fan disk, and perform a microstructure evaluation. Use 3.A.(2)(a) through 3.A.(2)(b) of GE Service Bulletin (SB) No. CF6-80C2 S/B 72-1121, dated 23 January 2004, to strip the thermal coating and perform the microstructure evaluation.2. Ultrasonic inspect, fluorescent penetrant inspect, and eddy current inspect stage 1 fan disk. Use 3.A.(2)(c) of GE SB No. CF6- 80C2 S/B 72-1121, to inspect the disk.3. Apply Cu-Ni-In thermal coating to the pressure faces and slot bottoms of the stage 1 fan disks, using 3.A.(2)(d) of GE SB No. CF6-80C2 S/B 72-1121.Later revisions of the above SB(s), approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-24-07, are considered acceptable for compliance with the equivalent Requirements of this AD.Note 2: FAA AD 2007-24-07 Amdt 39-15273 dated 15 November 2007 refers. |
| Compliance: | Within 3,500 cycles-since-last Cu-Ni-In thermal spray coating of the dovetail slots, but no later than 30 June 2008, unless previously accomplished. |
| This Airworthiness Directive becomes effective on 13 March 2008. |
| Background: | This AD results from a report that a repair shop did not meet the process requirements when applying Cu-Ni-In thermal coating to certain stage 1 fan disks. The actions detailed in this AD are to prevent possible uncontained release of multiple fan blades, resulting in damage to the aeroplane. |
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Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
21 January 2008