Document ID: chunk:federal_register_of_legislation:F2008L02853:body:0:p2
Version: federal_register_of_legislation:F2008L02853
Segment Type: other
Provision Reference: 
Character Range: 3056–6763

2000, check the serial numbers of the replaced ducts and replace them, as determined necessary, in accordance with the Accomplishment Instructions in the applicable Bombardier Service Bulletin listed below, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada.

   Model                       Service Bulletin           Date
   CL-600-1A11 (CL-600)        SB 600-0734                30 November 2006
   CL-600-2A12 (CL-601)        SB 601-0585                30 November 2006
   CL-600-2B16 (CL-601-3A/3R)  SB 601-0585                30 November 2006
   Cl-600-2B16 (CL-604)        SB 604-30-003 or           30 November 2006
                               SB 604-30-003, Revision 1  21 January 2008

                3. Applicable to:

                CL-600-2B16, Serial Numbers 5469 through 5635.

                Visually check the anti-ice piccolo ducts and replace them, as determined necessary, in accordance with the Accomplishment Instructions in Bombardier Service Bulletin 604-30-003, basic issue dated 30 November 2006, Revision 1, dated 21 January 2008, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada.

                4. Applicable to:

                CL-600-1A11 Serial Numbers 1004 through 1085.

                CL-600-2A12 Serial Numbers 3001 through 3066.

                CL-600-2B16 Serial Numbers 5001 through 5194.

                CL-600-2B16 Serial Numbers 5301 through 5635.

                No replacement/spare anti-ice piccolo duct with a part number/serial number listed in paragraph 2.C of any of the following Bombardier Service Bulletins, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada, is permitted to be installed on any aircraft.

             Model                       Service Bulletin          Date
             CL-600-1A11 (CL-600)        SB 600-0734               30 November 2006
             CL-600-2A12 (CL-601)        SB 601-0585               30 November 2006
             CL-600-2B16 (CL-601-3A/3R)  SB 601-0585               30 November 2006
             CL-600-2B16 (CL-604)        SB 604-30-003 Revision 1  21 January 2008

             Note:  Transport Canada AD CF-2008-18 dated 9 May 2008 refers.
Compliance:  For Requirement 1:  Within 30 days after the effective date of this AD, unless previously accomplished.

             For Requirements 2 and 3:  Within 2000 flight hours or 60 calendar months after the effective date of this AD, whichever comes first.

                For Requirement 4:  From the effective date of this AD.

             This Airworthiness Directive becomes effective on 28 August 2008.
Background:  There have been several cases of wing anti-ice piccolo duct failure reported on
             CL-600-2B19 (CRJ) aircraft.  Although there have been no failures reported on Challenger aircraft, similar ducts are installed on the above Challenger models.

             Upon investigation, it has been determined that ducts manufactured since June 2000, and installed since 1 August 2000, are susceptible to cracking due to the process used to drill the holes in the ducts.  These ducts were installed on CL-600-2B16 aircraft, serial numbers 5469 through 5635 in production, but may also have been installed as replacements on CL-600-1A11, CL-600-2A12 and other CL-600-2B16 aircraft.

             Cracking of the wing anti-ice piccolo ducts could result in air leakage, with an adverse effect on the anti-ice air distribution pattern and a possible unannunciated insufficient heat condition.  As a result, the aeroplane flight manual (AFM) instructions have been revised to provide proper annunciation