Airworthiness Directive 2018-20-23
one-timeAirworthiness Directives; General Electric Company Turbofan Engines
What this AD requires
We are superseding Airworthiness Directive (AD) 2017-07-04 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 2017-07-04 required removing certain HPC rotor stage 2-5 spools from service at times determined by a drawdown plan. This AD requires removing certain HPC rotor stage 2-5 spools from service before reaching the new reduced life limit and replacing them with parts eligible for installation. This AD was prompted by the publication of a GE service bulletin (SB) that increases the number of affected HPC rotor stage 2-5 spools and includes HPC rotor stage 2-5 spools that were inadvertently omitted from the applicability of AD 2017-07-04. We are issuing this AD to address the unsafe condition on these products.
Which aircraft AD 2018-20-23 applies to
Applies to engines with an HPC rotor stage 2-5 spool having a serial number listed in GE SB 72-0499 R01 (Feb 5, 2014), GE SB 72-0659 R01 (Feb 18, 2016), or GE SB 72-0714 Rev 01 (Feb 16, 2018) Appendix A; or with a spool P/N 351-103-109-0, 351-103-110-0, 351-103-147-0, or 351-103-152-0, with any serial number (specific serial numbers not included in provided applicability text).
Whether AD 2018-20-23 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.