Airworthiness directives › 2021-12-01
AD 2021-12-01 Airworthiness Directives; Engine Alliance Turbofan Engines
Applicability*9
This AD applies to Engine Alliance (EA) GP7270 and GP7277 model turbofan engines with low-pressure compressor (LPC) 1st-stage fan blades, part number (P/N) 5700531, 5702931, 5702931CL1, or 5702931CL2, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within the compliance time specified in Table 1 to paragraph (g)(1) of this AD, perform an ultrasonic inspection of the LPC 1st-stage fan blades using the Accomplishment Instructions, “For Fan Blades Installed In An Engine,” paragraph 1, or “For Fan Blades Not Installed In An Engine,” paragraph 1, as applicable, of EA Alert Service Bulletin (SB) EAGP7-A72-444, dated November 18, 2020. ER11JN21.000 (2) Thereafter, at intervals not to exceed 800 flight cycles since last inspection, perform an ultrasonic inspection of the LPC 1st-stage fan blades using the Accomplishment Instructions, “For Fan Blades Installed In An Engine,” paragraph 1, or “For Fan Blades Not Installed In An Engine,” paragraph 1, as applicable, of EA Alert SB EAGP7-A72-444, dated November 18, 2020. (3) If an ultrasonic inspection of an LPC 1st-stage fan blade results in a rejectable ultrasonic indication, remove the LPC 1st-stage fan blade from service and replace with a part eligible for installation before further flight. Note 1 to paragraph (g)(3): Guidance on determining a rejectable ultrasonic indication can be found in GP7000 1st Stage LPC Rotor (Fan) Blade Assembly Airfoil Ultrasonic Inspection for Cracks (Fan Blade Installed or Uninstalled), NDIP-1205, Revision C, dated September 15, 2020.
Unsafe condition
This AD was prompted by a report of an in-flight shutdown of an engine due to the fracture of multiple LPC 1st-stage fan blades. The FAA is issuing this AD to prevent failure of the LPC 1st-stage fan blades. The unsafe condition, if not addressed, could result in uncontained fan blade release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2019-25-13, Amendment 39-21011 (84 FR 71770, December 30, 2019).
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