Airworthiness directives › 2019-15-06
AD 2019-15-06 Airworthiness Directives; Engine Alliance Turbofan Engines
Applicability*9
This AD applies to all Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For all HPC stages 2-5 spools, perform an initial borescope inspection (BSI) of the HPC stage 6 seal ring position: (i) Borescope inspect the HPC stage 6 seal ring location in accordance with the Accomplishment Instructions, paragraph 1.F, of EA Alert Service Bulletin (ASB) EAGP7-A72-395, Revision No. 3, dated June 3, 2019, and within the compliance times specified in Table 1 to paragraph (g)(1) of this AD or within 230 engine cycles after the effective date of this AD, whichever occurs first. If the HPC stage 6 seal ring is installed incorrectly, remove the HPC stages 2-5 spool from service within 50 engine cycles and replace with a part eligible for installation, and correct the location of the stage 6 seal ring. (ii) Borescope inspect the HPC interstage 5-6 seal tooth forward and aft face for cracks and missing coating in accordance with the Accomplishment Instructions, paragraphs 2.C and 2.E, of EA ASB EAGP7-A72-395, Revision No. 3, dated June 3, 2019, and within the compliance times specified in Table 1 to paragraph (g)(1) of this AD or within 230 engine cycles after the effective date of this AD, whichever occurs first. (A) If the coating is missing on the HPC interstage 5-6 seal tooth forward or aft face, thereafter, repeat the BSI required by paragraph (g)(1)(ii) of this AD for cracks within every 150 engine cycles since you performed the last BSI. (B) If cracks are found in the HPC interstage 5-6 seal tooth forward or aft face, remove the HPC stages 2-5 spool from service and replace with a part eligible for installation before further flight. Table 1 to Paragraph ( g )(1)—Compliance Times Cycles since new (CSN) on HPC stages 2-5 spool as of January 11, 2019 (the effective date of AD 2018-22-07) Complete the inspection 2,499 or less Within 900 engine cycles after January 11, 2019, but not to exceed 2,850 CSN. 2,500 to 3,499 Within 350 engine cycles after January 11, 2019, but not to exceed 3,600 CSN. 3,500 or more Within 100 engine cycles after January 11, 2019. (2) For HPC stages 2-5 spools listed in Table 1 of Appendix A of EA SB EAGP7-72-413, dated February 4, 2019, perform the following repetitive on-wing inspections: (i) Borescope inspect the HPC interstage 5-6 seal tooth forward and aft face for cracks and missing coating in accordance with the Accomplishment Instructions, paragraphs 1.E. and 1.G., of EA SB EAGP7-72-413, dated February 4, 2019, within 300 engine cycles after completion of the initial inspection required by paragraph (g)(1)(ii) of this AD. If the engine has already accumulated more than 200 engine cycles since the inspection required by paragraph (g)(1)(ii) of this AD, perform this BSI of the HPC interstage 5-6 seal tooth forward and aft face within the next 100 engine cycles after the effective date of this AD, but before exceeding 500 engine cycles since the last inspection required by paragraph (g)(1)(ii) of this AD. (A) If the coating is found missing on the HPC interstage 5-6 seal tooth forward or aft face during the BSI, thereafter, repeat the BSI required by paragraph (g)(2)(i) of this AD for cracks within every 150 engine cycles since last BSI required by paragraph (g)(2)(i). (B) If cracks are found in the HPC interstage 5-6 seal tooth forward or aft face during the BSI, remove the HPC stages 2-5 spool from service and replace with a part eligible for installation before further flight. (ii) Thereafter, repeat the BSI required by paragraph (g)(2)(i) of this AD at intervals not exceeding 300 engine cycles since the last BSI.
Unsafe condition
This AD was prompted by a shop finding of axial cracks in the interstage 5-6 seal teeth of the high-pressure compressor (HPC) stages 2-5 spool spacer arm due to an incorrectly installed stage 6 seal ring. The FAA is issuing this AD to prevent failure of the HPC interstage 5-6 seal teeth and uncontained HPC stages 2-5 spool release. The unsafe condition, if not addressed, could result in an uncontained release of the HPC stages 2-5 spool, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2018-22-07, Amendment 39-19480 (83 FR 66609, December 27, 2018).
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