Airworthiness Directive · Amendment 39-23500 · Turbine engine compressor section
General Electric Company Engines
Quoted from the FAA's summary of this AD. The full text below is what applies.
This AD requires removing certain electronic engine control (EEC) full authority digital electronic control (FADEC) software versions from service and installing an updated EEC FADEC software that is eligible for installation.
Certain General Electric Company (GE) Model CF34-8C1, CF34-8C5, CF34- 8C5A1, CF34-8C5A2, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34- 8E5A1, CF34-8E5A2, CF34-8E5A2HA, CF34-8E6, and CF34-8E6A1 engines. Serial numbers and exceptions
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This AD applies to the General Electric Company (GE) Model engines identified in paragraphs (c)(1) and (2) of this AD.
(1) CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, and CF34-8C5B1 engines with an electronic engine control (EEC) full authority digital electronic control (FADEC) part number (P/N) 4120T00P29, 4120T00P30, 4120T00P37, 4120T00P38, 4120T00P45, 4120T00P46, 4120T00P53, 4120T00P54, 4120T00P57, or 4120T00P58 installed.
(2) CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E5A2HA, CF34-8E6, and CF34-8E6A1 engines with an EEC FADEC P/N 4120T00P42 (VIN 111E9320G43), P/N 4120T00P44 (VIN 111E9320G45), P/N 4120T00P48 (VIN 111E9320G49), P/N 4120T00P50 (VIN 111E9320G51), or P/N 4120T00P60 (VIN 111E9320G61) installed.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) Model CF34-8C1, CF34-8C5, CF34- 8C5A1, CF34-8C5A2, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34- 8E5A1, CF34-8E5A2, CF34-8E5A2HA, CF34-8E6, and CF34-8E6A1 engines. This AD was prompted by reports of in-flight "Engine Degraded" messages from the engine indicating and crew alerting system (EICAS) due to corrosion of the variable geometry (VG) system actuator. This AD requires removing certain electronic engine control (EEC) full authority digital electronic control (FADEC) software versions from service and installing an updated EEC FADEC software that is eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
For the purpose of this AD:
(1) “Group 1 engines” are GE Model CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, and CF34-8C5B1 engines.
(2) “Group 2 engines” are GE Model CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E5A2HA, CF34-8E6, and CF34-8E6A1 engines.
(3) An “EEC FADEC software version that is eligible for installation” on Group 1 engines is any software version that is V6.60 or later approved version.
(4) An “EEC FADEC software version that is eligible for installation” on Group 2 engines is any software version that is V5.70 or later approved version.
(1) For Group 1 engines, within 12 months after the effective date of this AD, replace any EEC FADEC software version that is V6.50 or earlier with an EEC FADEC software version that is eligible for installation.
(2) For Group 2 engines, within 12 months after the effective date of this AD, replace any EEC FADEC software version that is V5.60 or earlier with an EEC FADEC software version that is eligible for installation.
