Airworthiness directives › 2017-08-05
AD 2017-08-05 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) GE90-76B, GE90-77B, GE90-85B, GE90-90B, and GE90-94B turbofan engines with a high-pressure compressor (HPC) stage 8-10 spool, part numbers (P/Ns) 1694M80G04, 1844M90G01, or 1844M90G02, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done. (1) For HPC stage 8-10 spool, P/N 1694M80G04, all serial numbers (S/Ns), or HPC stage 8-10 spool, P/N 1844M90G01 or 1844M90G02, with a S/N listed in Figure 1 to paragraph (f) of this AD; perform an on-wing ultrasonic inspection (USI) of the stage 8 aft web upper face as follows: (i) Perform an initial USI after reaching 8,000 cycles since new (CSN), but, before exceeding 9,000 CSN, or within 500 cycles in service after July 29, 2016, whichever occurs later. (ii) Thereafter, perform a USI of the stage 8 aft web upper face every 500 cycles since last inspection. (iii) Compliance with paragraph (f)(2)(i) or (f)(2)(iii) of this AD is terminating action for the initial and repetitive USIs specified by paragraphs (f)(1)(i) and (ii) of this AD. Figure 1 to Paragraph ( f )—HPC Stage 8-10 Spool S/Ns Part Nos. Serial Nos. 1844M90G01 GWN005MF GWNBK753 GWNBS077 GWNBS497 GWNBS724 GWN005MG GWNBK754 GWNBS078 GWNBS499 GWNBS794 GWN0087M GWNBK841 GWNBS079 GWNBS500 GWNBS810 GWN0087N GWNBK842 GWNBS080 GWNBS501 GWNBS811 GWN00DGK GWNBK843 GWNBS081 GWNBS502 GWNBS812 GWN00DGL GWNBK844 GWNBS157 GWNBS609 GWNBS813 GWNBJ992 GWNBK952 GWNBS158 GWNBS610 GWNBS814 GWNBK667 GWNBK953 GWNBS159 GWNBS611 GWNBS910 GWNBK674 GWNBK954 GWNBS160 GWNBS612 GWNBS911 GWNBK675 GWNBK955 GWNBS266 GWNBS613 GWNBS912 GWNBK743 GWNBK956 GWNBS267 GWNBS614 GWNBS914 GWNBK744 GWNBK957 GWNBS268 GWNBS721 GWNBS915 GWNBK751 GWNBK958 GWNBS269 GWNBS722 GWNBS982 GWNBK752 GWNBK959 GWNBS270 GWNBS723 GWNBS983 1844M90G02 GWN00C2T GWN01C5N GWN02N8D GWN03RTM GWN04E21 GWN00C2V GWN01GE2 GWN02T3R GWN03RTP GWN04GHT GWN00G2N GWN01GE3 GWN02WGM GWN040RL GWN04GHW GWN00G2P GWN01GE4 GWN0311K GWN040RM GWN04GJ0 GWN00PFP GWN01GE6 GWN035PP GWN040RN GWN04JW6 GWN00PFR GWN01WH1 GWN038TD GWN040RP GWN04JW7 GWN00T2N GWN02688 GWN039TG GWN04202 GWN04JW8 GWN00YHV GWN02689 GWN03G2R GWN0435W GWN04L7K GWN0125G GWN0268A GWN03G2W GWN04360 GWN04L7L GWN0125H GWN02DP2 GWN03G30 GWN04361 GWN04MT7 GWN0166K GWN02DP3 GWN03JPC GWN04362 GWN04MT8 GWN01C5K GWN02F9F GWN03JPD GWN04ATG GWNBS984 GWN01C5L GWN02F9G GWN03N8P GWN04ATH GWN01C5M GWN02L9T GWN03N8R GWN04E20 (2) For all HPC stage 8-10 spools, P/N 1694M80G04, 1844M90G01, or 1844M90G02, perform an eddy current inspection (ECI) of the stage 8 aft upper face as follows: (i) Perform an initial ECI of the stage 8 aft web upper face at the next shop visit after the effective date of this AD. (ii) Thereafter, perform an ECI of the stage 8 aft web upper face at each subsequent shop visit. (iii) If you performed an ECI of the stage 8 aft web upper surface before the effective date of the AD, you met the requirements of paragraph (f)(2)(i) of this AD. (3) Remove from service any HPC stage 8-10 spool that fails the inspection required by paragraphs (f)(1) or (2) of this AD, and replace with a spool eligible for installation.
Required actions
For the purpose of this AD, an engine shop visit is the induction of an engine into the shop for maintenance during which the compressor discharge pressure seal face is exposed.
Unsafe condition
This AD was prompted by an uncontained failure of the HPC stage 8-10 spool. We are issuing this AD to prevent failure of the HPC stage 8-10 spool, uncontained rotor release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2016-13-05, Amendment 39-18569 (81 FR 41208, June 24, 2016; corrected June 30, 2016, 81 FR 42475).
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