Airworthiness directives › 2005-07-06
AD 2005-07-06 Airworthiness Directives; General Electric Company CF34-8C1 Series and CF34-8C5 Series Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) CF34-8C1 series and CF34-8C5 series turbofan engines, with master variable geometry (VG) actuators, GE part number 4120T02P02, serial number (SN) APM238AE, and SNs APM242AE and up; and Arkwin Industries, Inc. Parts Manufacturer Approval (PMA) part number 1211508-002, SN 238AE and SNs 242AE and up installed. The Arkwin PMA parts are also marked with PN 4120T02P02. These engines are installed on, but not limited to, Bombardier Inc. Model CL-600-2C10 (CRJ-700 & -701) and CL-600-2D24 (CRJ-900) airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) After the effective date of this AD, do not install any master VG actuators specified in this AD onto any engine. Initial Review (g) Within 10 days after the effective date of this AD, initially review the Maintenance Data Computer (MDC) fault history, and if the MDC is inoperative, review the Engine Indication and Crew Alerting System (EICAS) for fault messages, and replace actuators with faults reported by the FADEC. Follow the review and replacement requirements of paragraph 3 of the Accomplishment Instructions of GE Alert Service Bulletin (ASB) No. CF34-8C-AL S/B 75-A0007, Revision 3, dated February 14, 2005. Repetitive Review (h) At intervals not to exceed 10 days, repetitively review the MDC fault history, and if the MDC is inoperative, review the EICAS for fault messages, and replace actuators with faults reported by the FADEC. Follow the review and replacement requirements of paragraph 3 of the Accomplishment Instructions of GE ASB No. CF34-8C-AL S/B 75-A0007, Revision 3, dated February 14, 2005. Optional Terminating Action (i) Replacing an affected master VG Actuator with a master VG actuator not specified in this AD is terminating action for the repetitive inspections requirement specified in paragraph (h) of this AD for that actuator. Credit for Actions Previously Completed (j) Inspections completed before the effective date of this AD using GE ASB No. CF34-8C-AL S/B 75-A0007, Revision 1 dated November 7, 2003; or Revision 2 dated December 16, 2004; or Revision 3 dated February 14, 2005; are acceptable for compliance with the corresponding inspection in this AD. Alternative Methods of
Unsafe condition
This AD results from the need to add to the list of affected parts, master VG actuators made by parts PMA. We are issuing this AD to prevent dual-channel electrical signal faults in the VG master actuator, which will cause an uncommanded reduction of thrust to idle with a subsequent loss of the ability to advance thrust above idle, and which will result in a multiengine loss of thrust if dual-channel faults occur on more than one engine simultaneously.
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