Airworthiness Directive · Amendment 39-19097 · Turbine engine compressor section
Engine Alliance Turbofan Engines
This AD applies to all Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines.
We are superseding Emergency Airworthiness Directive (AD) 2017-21-51 for all Engine Alliance (EA) GP7200 series turbofan engines. AD 2017-21-51 was sent previously to all known U.S. owners and operators of GP7200 series turbofan engines. AD 2017-21-51 required visual inspections of all fan hubs for damage. This AD retains the same required actions as AD 2017-21-51 and clarifies the compliance requirements. This AD was prompted by the failure of a GP7200 fan hub. We are issuing this AD to address the unsafe condition on these products.
(1) Perform a visual inspection of the fan hub in accordance with the Accomplishment Instructions, paragraph 1.B., 1.C., and 1.D., of EA Alert Service Bulletin (ASB) EAGP-A72-383, Revision No. 1, dated October 12, 2017, at the times specified in paragraphs (g)(1)(i) through (iii) of this AD.
(i) For fan hubs with 3,500 cycles since new (CSN) or more on the effective date of this AD, inspect within 2 weeks after the effective date of this AD.
(ii) For fan hubs with 2,000 CSN or more, but less than 3,500 CSN, on the effective date of this AD, inspect within 5 weeks after the effective date of this AD.
(iii) For fan hubs with less than 2,000 CSN on the effective date of this AD, inspect within 8 weeks after the effective date of this AD.
(2) If defects or damage to the fan hub are found outside the serviceable limits specified in Table 1 of EA ASB EAGP7-A72-383, Revision No. 1, dated October 12, 2017, remove the hub from service and replace with a part that passed the inspection specified in paragraph (g)(1) of this AD, prior to further flight.
