Airworthiness directives › 2021-23-51
AD 2021-23-51 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, CF34-8C5A3, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E6, and CF34-8E6A1 model turbofan engines installed on an airplane that has accumulated more than 250 parked days outdoors in the last 24 months within 10 miles (16 km) from a saltwater coastline. Note 1 to paragraph (c): A “parked day” is 24 consecutive hours with no engine operation.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) On one engine installed on an airplane, before accumulating 30 flight hours (FHs) or within 5 calendar days, whichever occurs first after the effective date of this AD, perform an inspection of the master compressor VG actuator, significant item number (SIN) 30401, and slave compressor VG actuator, SIN 30402, in accordance with the Accomplishment Instructions, paragraphs 3.A.(1) and (2), of GE CF34-8C Service Bulletin (SB) 75-0028 R00 (GE CF34-8C SB 75-0028) or GE CF34-8E SB 75-0023 R00 (GE CF34-8E SB 75-0023), both dated November 2, 2021, as applicable to the engine model. (2) On the other engine installed on the airplane, not inspected as required by paragraph (g)(1) of this AD, before accumulating 350 FHs or within 60 calendar days, whichever occurs first after the effective date of this AD, perform an inspection of the master compressor VG actuator, SIN 30401, and slave compressor VG actuator, SIN 30402, in accordance with the Accomplishment Instructions, paragraphs 3.A.(1) and (2), of GE CF34-8C SB 75-0028 or GE CF34-8E SB 75-0023, as applicable to the engine model. (3) For engines not in service, before further flight, perform an inspection of the master compressor VG actuator, SIN 30401, and slave compressor VG actuator, SIN 30402, in accordance with the Accomplishment Instructions, paragraphs 3.A.(1) and (2), of GE CF34-8C SB 75-0028 or GE CF34-8E SB 75-0023, as applicable to the engine model. (4) If the master compressor VG actuator, SIN 30401, or the slave compressor VG actuator, SIN 30402, does not pass any inspection required by paragraphs (g)(1) through (3) of this AD, before further flight, remove the part and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by an in-flight shutdown of an engine and subsequent investigation by the manufacturer that revealed a broken variable geometry (VG) actuator rod end caused by corrosion and seizure of the rod end bearing. The FAA is issuing this AD to detect corrosion and seizure of the rod end bearing. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of engine thrust control, and reduced control of the airplane.
Affected ADs
None.
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