Airworthiness directives › 2021-26-22
AD 2021-26-22 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 an installed high-pressure turbine (HPT) disk with a serial number (S/N) listed in Table 1 or 2 of Appendix A, paragraph 4., in GE CF6-80C2 Service Bulletin (SB) 72-1562 R05, dated March 19, 2021 (GE SB 72-1562), and Table 1 of Appendix—A, paragraph 4., in GE CF6-80A SB 72-0869 R03, dated March 19, 2021 (GE SB 72-0869).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For CF6-80C2 model turbofan engines, at each piece-part exposure after the effective date of this AD, perform a UI of affected HPT stage 1 and stage 2 disks using the Accomplishment Instructions, paragraph 3.A.(2), of GE SB 72-1562. (2) For CF6-80A model turbofan engines, at each piece-part exposure after the effective date of this AD, perform a UI of affected HPT stage 2 disks using the Accomplishment Instructions, paragraph 3.A.(2), of GE SB 72-0869. (3) If any disk fails the inspection required by paragraph (g)(1) or (2) of this AD, replace the disk with a part eligible for installation 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 requiring ultrasonic inspection (UI). 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 2020-20-13, Amendment 39-21269 (85 FR 63193, October 7, 2020).
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