Airworthiness directives › 2018-19-22
AD 2018-19-22 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to all General Electric Company (GE) CF34-10A16, CF34-10E2A1, CF34-10E5, CF34-10E5A1, CF34-10E6, CF34-10E6A1, CF34-10E7, and CF34-10E7-B turbofan engines with high-pressure turbine (HPT) front rotating air seals listed in Appendices A and B, of GE CF34-10E Service Bulletin (SB) 72-0347 R00, dated August 3, 2018, that were not inspected and repaired using GE CF34-10E SB 72-0347 R00, dated August 3, 2018.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Remove the HPT front rotating air seal listed in Appendix A, of GE CF34-10E SB 72-0347 R00, dated August 3, 2018, and replace with a part eligible for installation within the following cycles: (i) If the HPT front rotating air seal has 17,499 cycles since new (CSN) or more on the effective date of this AD, remove within 250 cycles in service (CIS). (ii) If the HPT front rotating air seal has 16,500 to 17,498 CSN on the effective date of this AD, remove within 500 CIS but not to exceed 17,750 CSN. (iii) If the HPT front rotating air seal has 15,500 to 16,499 CSN on the effective date of this AD, remove within 750 CIS but not to exceed 17,000 CSN. (iv) If the HPT front rotating air seal has 14,500 to 15,499 on the effective date of this AD, remove within 1,000 CIS but not to exceed 16,250 CSN. (v) If the HPT front rotating air seal has 12,800 to 14,499 on the effective date of this AD, remove within 1,500 CIS but not to exceed 15,500 CSN. (vi) If the HPT front rotating air seal has 10,800 to 12,799 CSN on the effective date of this AD, remove within 2,000 CIS but not to exceed 14,300 CSN. (vii) If the HPT front rotating air seal has 8,450 to 10,799 CSN on the effective date of this AD, remove within 2,500 CIS but not to exceed 12,800 CSN. (viii) If the HPT front rotating air seal has fewer than 8,450 CSN on the effective date of this AD, remove at next piece-part exposure or before accumulating 10,950 CSN, whichever comes first. (2) Remove the HPT front rotating air seal, listed in Appendix B, of GE CF34-10E SB 72-0347 R00, dated August 3, 2018, from service and replace with a part eligible for installation before exceeding the CSN listed in Appendix B, of GE CF34-10E SB 72-0347 R00, dated August 3, 2018.
Unsafe condition
This AD was prompted by cracks found in the HPT front rotating air seal. We are issuing this AD to prevent failure of the HPT front rotating air seal. The unsafe condition, if not addressed, could result in an uncontained release of the HPT front rotating air seal, damage to the engine, and damage to the airplane.
Affected ADs
None.
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