Airworthiness Directive · Amendment 39-17694 · General Electric Company Turbofan Engines
General Electric Company Turbofan Engines
Superseded. A later AD replaced this one: AD 2017-07-04. Comply with the one in force.
This AD applies to General Electric Company (GE) GE90-110B1 and GE90-115B turbofan engines with high pressure compressor (HPC) rotor stage 2-5 spools, part numbers (P/Ns) 351-103-106-0, 351-103-107-0, 351-103-141-0, 351-103-142-0, 351-103-144-0, 351-103-145-0, 351-103-148-0, 351-103-149-0, and 351-103-151-0, with spool serial numbers listed in paragraph 4, Appendix A of GE Service Bulletin (SB) No. GE90-100 S/B 72-0499, dated August 14, 2013.
We are adopting a new airworthiness directive (AD) for General Electric Company (GE) GE90-110B1 and GE90-115B turbofan engines with certain high pressure compressor (HPC) rotor stage 2-5 spools installed. This AD requires removing these spools from service at times determined by a drawdown plan. This AD was prompted by reports of cracks in HPC rotor stage 2-5 spool aft spacer arms. We are issuing this AD to prevent failure of a critical life-limited rotating engine part, which could result in an uncontained engine failure and damage to the airplane.
Remove from service HPC rotor stage 2-5 spools with serial numbers listed in paragraph 4, Appendix A of GE SB No. GE90-100 S/B 72-0499, dated August 14, 2013, as follows:
(1) For spools with fewer than 4,500 cycles since new (CSN) on the effective date of this AD, before exceeding 5,000 CSN.
(2) For spools with 4,500 CSN or more but fewer than 5,200 CSN on the effective date of this AD, within an additional 500 cycles in service (CIS) after the effective date of this AD but not to exceed 5,500 CSN.
(3) For spools with 5,200 CSN or more but fewer than 5,600 CSN on the effective date of this AD, within an additional 300 CIS after the effective date of this AD but not to exceed 5,800 CSN.
(4) For spools with 5,600 CSN or more but fewer than 5,800 CSN on the effective date of this AD, within an additional 200 CIS after the effective date of this AD but not to exceed 5,850 CSN.
(5) For spools with 5,800 CSN or more but fewer than 6,000 CSN on the effective date of this AD, within an additional 50 CIS after the effective date of this AD but not to exceed 6,000 CSN.
(6) For spools with 6,000 CSN or more on the effective date of this AD, before the next flight.
(7) For spools that are not installed on the effective date of this AD and are subsequently installed onto any engine after the effective date of this AD, before exceeding 5,000 CSN.
After the effective date of this AD, do not install or re-install onto any engine any HPC rotor stage 2-5 spool with a serial number listed in paragraph 4, Appendix A of GE SB No. GE90-100 S/B 72-0499, dated August 14, 2013, that exceeds 5,000 CSN.
