Airworthiness directives › 2008-05-01
AD 2008-05-01 Airworthiness Directives; General Electric Company CF34-8C1/-8C5/-8C5B1/-8E5/-8E5A1, and CF34-10E Series Turbofan Engines
Applicability*9
This AD applies to: (1) General Electric Company (GE) CF34-8C1/-8C5/-8C5B1/-8E5/-8E5A1 turbofan engines, with GE fuel metering unit (FMU) part number (P/N) 4120T01P02, serial numbers (SNs) WYG89156 through WYGB4222, and Woodward Governor FMU Vendor Identification Number (VIN) 8061-926, SNs 11954378 through 15140071. (2) GE CF34-10E series turbofan engines, with GE FMU P/N 2043M10P05, SNs WYGA3251 through WYGB4085, and Woodward Governor FMU VIN 8063-884, SNs 13335695 through 15028283. (3) CF34-8C1/-8C5/-8C5B1 turbofan engines are installed on, but not limited to, Bombardier Inc. Model CL-600-2C10 (CRJ-700 & -701), and CL-600-2D24/-2D15 (CRJ-900) airplanes. (4) CF34-8E5/-8E5A1 turbofan engines are installed on, but not limited to, Embraer ERJ 170-100/ -200 series airplanes. (5) CF34-10E series turbofan engines are installed on, but not limited to, Embraer ERJ 190-100/-200 series airplanes.
Compliance
You are responsible for having the actions required by this AD performed within 2,200 flight hours after the effective date of this AD, but not to exceed 24 months after the effective date of this AD, unless the actions have already been done. Onetime Test of the FMU (f) Perform a onetime test of the FMU for a miswired (reversed polarity) condition of the input wires to the overspeed solenoid. (g) Use paragraph 3A of the Accomplishment Instructions of GE Service Bulletin (SB) No. CF34-8C-AL S/B 73-0030, Revision 3, dated November 1, 2007, SB No. CF34-8E-AL S/B 73-0015, Revision 3, dated November 1, 2007, or SB No. CF34-10E S/B 72-0067, Revision 2, dated August 28, 2007, as applicable, to do the test. (h) If the FMU fails the test, remove the FMU. Previous Credit (i) If you performed the actions specified in paragraphs (f) through (h) of this AD using the inspection procedures in the following SBs, before the effective date of this AD, you satisfied the requirements of this AD. (1) GE SB No. CF34-8C-AL S/B 73-0030, dated May 25, 2007, Revision 1, dated July 19, 2007, or Revision 2, dated August 28, 2007. (2) GE SB No. CF34-8E-AL S/B 73-0015, dated June 1, 2007, Revision 1, dated July 19, 2007, or Revision 2, dated August 28, 2007. (3) GE SB No. CF34-10E S/B 72-0067, dated June 7, 2007 or Revision 1, dated July 26, 2007. Alternative Methods of
Unsafe condition
This AD results from the discovery of miswired FMU overspeed solenoids in the field. We are issuing this AD to prevent the engine from failing to shutdown during an overspeed which may lead to uncontained engine failure.
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