Airworthiness directives › 2022-10-04
AD 2022-10-04 Airworthiness Directives; Engine Alliance Turbofan Engines
Applicability*9
This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines with an installed: (1) Stages 7-9 compressor rotor spool, part number (P/N) 2031M90G05, having serial number (S/N) GWN0R7R3; or (2) Stages 7-9 compressor rotor spool, P/N 2031M90G07, having S/N GWN0R9R3, GWN0R9TC, GWN0R9TM, GWN0RCT5, or GWN0RCT6.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 500 flight cycles (FCs) after the effective date of this AD, remove the affected stages 7-9 compressor rotor spool from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed certain stages 7-9 compressor rotor spools were manufactured from a billet of material suspected of having foreign material embedded. The FAA is issuing this AD to prevent failure of the high-pressure compressor (HPC) stage 8 rotor disk. The unsafe condition, if not addressed, could result in uncontained release of the HPC stage 8 rotor disk, damage to the engine, and damage to the airplane.
Affected ADs
None.
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