1AD/CF34/4 Amdt 1 - Main Fuel Control

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General Electric Turbine Engines - CF34 Series

AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CF34/4 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/CF34/4

Amdt 1

Main Fuel Control 7/2000

Applicability: General Electric CF34-1A, -3A, -3A1, -3A2, -3B and -3B1 series engines installed on but not limited to Bombardier, Inc. Canadair model CL-600-2A12, -2B16 and - 2B19 aircraft.

Requirement: 1. If a Main Fuel Control (MFC) part numbers (P/N’s) 6078T55P02 thru P10 inclusive is installed, and the MFC has Buna-N preformed packings (O-rings), P/N’s R1307P020 and R1307P141 incorporated, do one of the following:

(a) Replace Buna-N O-rings with Viton O-rings, P/N’s M83485-1-020 (M83485/1-020) and 37B201714P130, in accordance with the Accomplishment Instructions, paragraph 3.A., of alert service bulletin (ASB) CF34AL 73-A0025, dated July 7, 1999 or ASB CF34BJ 73-A0040, dated July 7, 1999, OR

(b) For all CF34-3A1 engines with serial numbers (SN’s) 807001 and up, CF34- 3B engines with SN’s 872001 and up, and CF34-3B1 engines with SN’s 872001 and up, with MFC P/Ns 6078T55P02 thru P10 inclusive installed, install a MFC with a flange vent groove that conforms to the requirements of CF34 ASB CF34AL S/B 73-0026 dated August 12, 1999, or CF34BJ S/B 73- 0041, dated August 12, 1999 or Revision 1, dated November 1, 1999.

2. For all CF34-1A, -3A, and -3A2 series engines with SN’s 350003 thru 350525, install an MFC with a flange groove that conforms to the requirements of CF34 ASB CF34BJ S/B 73-0041 dated August 12, 1999 or Revision 1 dated November 1, 1999.

3. Install a serviceable MFC with improved overspeed protection as follows:

(a) For all CF34-1A, -3A, and -3A2 series engines, install a serviceable MFC in accordance with step 2A thru step 2G of the Accomplishment Instructions of CF34 ASB No. A73-33, dated November 21, 1997, or Revision 1, dated May 29, 1998 or Revision 2, dated March 9, 1999, or in accordance with step 3A(1) thru step 3A(7) of the Accomplishment Instructions of CF34 ASB No. CF34BJ 73-A0033, Revision 3, dated September 9, 1999, or Revision 4, dated November 1, 1999.