Airworthiness directives › 2017-07-04
AD 2017-07-04 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
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.
Compliance
(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.
Required actions
The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE-AD-AMOC@faa.gov.
Unsafe condition
This AD was prompted by reports of cracks in HPC rotor stage 2-5 spool aft spacer arms since AD 2013-24-17.We are issuing this AD to prevent failure of the HPC rotor stage 2-5 spools, uncontained spool release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2013-24-17, Amendment 39-17694 (78 FR 76045, December 16, 2013) (“AD 2013-24-17”).
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