Airworthiness directives › 2018-22-05
AD 2018-22-05 Airworthiness Directives; Engine Alliance Turbofan Engines
Applicability*9
This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines, with a high-pressure turbine (HPT) stator case (HPT case), part number (P/N) 2060M40G02 or 2137M29G01 installed, and with HPT case serial numbers (S/Ns) listed in Planning Information, Table 1, of EA Alert Service Bulletin (ASB) EAGP7-A72-401, dated August 23, 2018, and in Planning Information, Table 1, of EA Service Bulletin (SB) EAGP7-72-399, dated June 4, 2018.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For HPT cases listed in Planning Information, Table 1, of EA ASB EAGP7-A72-401, dated August 23, 2018, remove the affected HPT case from service within the cycles identified in Table 1 of EA SB EAGP7-A72-401 after the effective date of this AD. (2) For HPT cases listed in Planning Information, Table 1, of EAGP7-72-399, dated June 4, 2018, remove the affected HPT cases from service, using the number of part cycles since new (PCSN) or part cycles since overhaul (PCSO), whichever is less, as specified in Table 1 to paragraph (g)(2) of this AD. Table 1 to Paragraph ( g )(2) of This AD—Compliance Times PCSN or PCSO Remove from service within these cycles after the effective date of this AD Less than 1000 150 cycles. 1001 to 2000 125 cycles. 2001 to 3000 100 cycles. 3001 to 4000 75 cycles. 4001 to 5000 50 cycles. 5001 or more 25 cycles. (3) Replace the removed HPT case with a part eligible for installation before further flight.
Unsafe condition
This AD was prompted by the discovery of a quality escape at a manufacturing facility performing unapproved welds on HPT cases. We are issuing this AD to prevent failure of the HPT case. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
Affected ADs
None.
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