Airworthiness directives › 2005-07-09
AD 2005-07-09 Airworthiness Directives; General Electric Company CF34-8E Series Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) CF34-8E series turbofan engines with the master variable geometry (VG) actuators, GE part number (P/N) 4120T02P02, serial number (SN) APM238AE, and SNs APM242AE and up; and Arkwin Industries, Inc. Parts Manufacturer Approval (PMA) P/N 1211508-002, SN 238AE, and SNs 242AE and up installed. The Arkwin PMA parts are also marked with P/N 4120T02P02. These engines are installed on, but not limited to, Embraer 170 series 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 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 airplane computer systems for fault messages, and replace actuators with faults reported by the full-authority digital electronic control (FADEC). Follow the review and replacement requirements of paragraph 3 of the Accomplishment Instructions of GE Alert Service Bulletin (ASB) No. CF34-8E-AL S/B 75-A0001, Revision 3, dated February 14, 2005. The specific review instructions depend on the version of FADEC software installed at the time of the review, as detailed in the ASB. Repetitive Review (h) At intervals not to exceed 10 days, repetitively review the computer systems 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. CF34-8E-AL S/B 75-A0001, Revision 3, dated February 14, 2005. The specific review instructions depend on the version of FADEC software installed at the time of the review, as detailed in the ASB. Optional Terminating Action (i) As an optional terminating action to the repetitive reviews specified in this AD, replace the master VG actuator with a master VG actuator not specified in this AD. Previous Credit (j) Previous credit is allowed for reviews and replacements of master VG actuators performed before the effective date of this AD, using paragraph 3 of GE ASB No. CF34-8E-AL S/B 75-A0001 Revision 1, dated February 10, 2004, or Revision 2, dated December 15, 2004, or Revision 3, dated February 14, 2005. Alternative Methods of
Unsafe condition
This AD results from the need to add to the list of affected parts, master VG actuators made by PMA holder, Arkwin Industries, Inc. 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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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1