Airworthiness Directive · Amendment 39-18842 · Turbine engine compressor section
General Electric Company Turbofan Engines
Superseded. A later AD replaced this one: AD 2018-20-23. Comply with the one in force.
All GE90-110B1 and GE90-115B engines with high-pressure compressor (HPC) stage 2-5 spools, with:
(1) a part number (P/N) 351-103-106-0, 351-103-107-0, 351-103-108-0, 351-103-141-0, 351-103-142-0, 351-103-143-0, 351-103-144-0, 351-103-145-0, 351-103-146-0, 351-103-148-0, 351-103-149-0, 351-103-150-0, or 351-103-151-0; and
(2) a serial number listed in paragraph 4, Appendix A, of GE Service Bulletin (SB) GE90-100 SB 72-0659 R01, dated February 18, 2016.
We are superseding Airworthiness Directive (AD) 2013-24-17 for General Electric Company (GE) GE90-110B1 and GE90-115B turbofan engines with certain high-pressure compressor (HPC) rotor stage 2-5 spools installed. AD 2013-24-17 required removing these spools from service at times determined by a drawdown plan. This AD retains the same requirements as AD 2013-24-17. This AD also adds additional part number (P/N) HPC spools to the applicability. This AD was prompted by reports of cracking on these additional spools. We are issuing this AD to correct the unsafe condition on these products.
(1) Comply with this AD within the compliance times specified, unless already done.
(2) Remove from service HPC rotor stage 2-5 spools listed in paragraph 4, Appendix A, of GE SB GE90-100 SB 72-0659 R01, dated February 18, 2016, as follows:
(i) For spools that have fewer than 4,500 flight cycles since new (CSN) on the effective date of this AD, remove before exceeding 5,000 CSN.
(ii) For spools that have 4,500 CSN or more but fewer than 5,200 CSN on the effective date of this AD, remove within 500 cycles in service (CIS) but not to exceed 5,500 CSN.
(iii) For spools that have 5,200 CSN or more but fewer than 5,600 CSN on the effective date of this AD, remove within 300 CIS but not to exceed 5,800 CSN.
(iv) For spools that have 5,600 CSN or more but fewer than 5,800 CSN on the effective date of this AD, remove within 200 CIS but not to exceed 5,850 CSN.
(v) For spools that have 5,800 CSN or more but fewer than 6,000 CSN on the effective date of this AD, remove within 50 CIS but not to exceed 6,000 CSN.
(vi) For spools that have 6,000 CSN or more on the effective date of this AD, remove before the next flight.
