Airworthiness directives › 2018-11-16
AD 2018-11-16 Airworthiness Directives; Engine Alliance Turbofan Engines
Applicability*9
This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines with serial numbers (S/Ns) identified in Table 3 in Planning Information of Engine Alliance (EA) Alert Service Bulletin (ASB) EAGP7-A72-389, Revision No. 2, dated April 17, 2018.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 120 days after the effective date of this AD: (1) For engine fan hubs at the low-pressure compressor (LPC) module assembly level: (i) Perform a visual inspection of the engine fan hub, in accordance with the Accomplishment Instructions, For Fan Hubs at LPC Module Assembly Level, paragraphs 1.A.(1), 1.A.(4), and 1.A.(6)(a), of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (ii) Perform an eddy current inspection (ECI) of the engine fan hub blade slot bottoms and front edges, in accordance with the Accomplishment Instructions, For Fan Hubs at LPC Module Assembly Level, paragraphs 2.A and 2.B, of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (2) For engine fan hubs at the piece part level: (i) Perform a visual inspection of the engine fan hub, in accordance with the Accomplishment Instructions, For Fan Hubs at Piece Part Level, paragraphs 1.A.(1) and 1.A.(3), of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (ii) Perform an ECI of the engine fan hub blade slot bottoms and front edges, in accordance with the Accomplishment Instructions, For Fan Hubs at Piece Part Level, paragraphs 2.A and 2.B, of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (3) For engine fan hubs installed in an engine (on-wing or off-wing): (i) Perform a visual inspection of the engine fan hub, in accordance with the Accomplishment Instructions, For Fan Hubs Installed in an Engine, paragraphs 1.C.(1), 1.C.(5), and 1.C.(7)(a), of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (ii) Perform an ECI of the engine fan hub blade slot bottoms and front edges, in accordance with the Accomplishment Instructions, For Fan Hubs Installed in an Engine, paragraphs 1.D.(1) and 1.D.(2), of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018. (4) If the engine fan hub visual inspection reveals defects or damage to the engine fan hub that are found outside the serviceable limits specified in Table 4 in the Accomplishment Instructions of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018, remove the engine fan hub from service and replace with a part that is eligible for installation, prior to further flight. (5) If the fan hub ECI results in a rejectable indication, per the Appendix, Added Data, of EA ASB EAGP7-A72-389, Revision No. 2, dated April 17, 2018, remove the hub from service and replace with a part that is eligible for installation, prior to further flight.
Unsafe condition
This AD was prompted by an uncontained failure of the engine fan hub. We are issuing this AD to detect defects, damage, and cracks that could result in an uncontained failure of the engine fan hub. The unsafe condition, if not addressed, could result in uncontained failure of the engine fan hub, damage to the engine, and damage to the airplane.
Affected ADs
None.
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