Airworthiness directives › 2018-22-07
AD 2018-22-07 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) Borescope inspect the stage 6 seal ring location in accordance with the Accomplishment Instructions, paragraph 1.F, in EA Alert Service Bulletin (ASB) EAGP7-A72-395, Revision No. 2, dated August 2, 2018, and within the compliance times specified in Table 1 to paragraph (g) of this AD. If the stage 6 seal ring is incorrectly installed, remove the HPC stages 2-5 spool from service within 50 cycles and replace with a part eligible for installation. (2) Borescope inspect the interstage 5-6 seal tooth aft face and interstage 5-6 forward face for cracks and missing coating in accordance with the Accomplishment Instructions, paragraphs 2.C and 2.E, in EA ASB EAGP7-A72-395, Revision No. 2, dated August 2, 2018, and within the compliance times specified in Table 1 to paragraph (g) of this AD. (i) If coating is missing on the interstage 5-6 seal tooth forward or aft faces, repeat the borescope inspection required by paragraph (g)(2) of this AD for cracks every 150 cycles. (ii) If cracks are found in the interstage 5-6 seal tooth forward or aft faces, remove the HPC stages 2-5 spool from service and replace with a part eligible for installation before further flight. ER27DE18.041
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. We are issuing this AD to prevent failure of the HPC stage 5-6 seal teeth and uncontained HPC stages 2-5 spool release. The unsafe condition, if not addressed, could result in an uncontained failure of the HPC stages 2-5 spool, damage to the engine, and damage to the airplane.
Affected ADs
None.
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