Airworthiness directives › 2020-20-13
AD 2020-20-13 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) CF6-80A, CF6-80A1, CF6-80A2, CF6-80A3, CF6-80C2A1, CF6-80C2A2, CF6-80C2A3, CF6-80C2A5, CF6-80C2A5F, CF6-80C2A8, CF6-80C2B1, CF6-80C2B1F, CF6-80C2B2, CF6-80C2B2F, CF6-80C2B4, CF6-80C2B4F, CF6-80C2B5F, CF6-80C2B6, CF6-80C2B6F, CF6-80C2B6FA, CF6-80C2B7F, CF6-80C2D1F, CF6-80C2L1F, and CF6-80C2K1F model turbofan engines with high-pressure turbine (HPT) disks with serial numbers listed in Tables 1 and 2 of Appendix A in GE CF6-80C2 Service Bulletin (SB) 72-1562 R04, dated May 29, 2019; and Table 1 of Appendix A in GE CF6-80A SB 72-0869 R02, dated May 29, 2019.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) After the effective date of this AD, perform an ultrasonic inspection (UI) for cracks in HPT stage 1 and stage 2 disks on the CF6-80C2 turbofan engine at each piece-part exposure using the Accomplishment Instructions, paragraph 3.A.(2), of GE CF6-80C2 SB 72-1562 R04, dated May 29, 2019. (2) After the effective date of this AD, perform a UI for cracks in HPT stage 2 disks on the CF6-80A turbofan engine at each piece-part exposure using the Accomplishment Instructions, paragraph 3.A.(2), of GE CF6-80A SB 72-0869 R02, dated May 29, 2019. (3) If any disk fails the inspection required by paragraphs (g)(1) and (2) of this AD, replace the disk before further flight.
Unsafe condition
This AD was prompted by an uncontained failure of an HPT stage 2 disk and the manufacturer's determination to expand the population of affected HPT disks. The FAA is issuing this AD to prevent failure of the HPT stage 1 disk (CF6-80C2 engines) and the HPT stage 2 disk (CF6-80C2 and CF6-80A engines). The unsafe condition, if not addressed, could result in an uncontained HPT disk release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2018-15-04, Amendment 39-19336 (83 FR 43739, August 28, 2018).
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