Document ID: chunk:federal_register_of_legislation:F2009L02260:body:0:p1
Version: federal_register_of_legislation:F2009L02260
Segment Type: other
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Character Range: 0–2934

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 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.

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes
AD/DHC-8/148  Elevator Power Control Unit  7/2009

Applicability:  Bombardier Inc. DHC-8 Models 400, 401 and 402, Serial Numbers (S/N) 4135 through 4149.
Requirement:       1. Inspect the serial number of each of the six installed elevator Power Control Units (PCU)s, Part Number (P/N) 390600-1007.

                     a. Compliance with this AD is complete, and no further action is required, if all six of the installed PCUs have suffix "A" after the serial number and/or have a serial number that is not in the following range:

                     PCU S/Ns 238, 698, 783 through 788, 790, 793, 795, 802, 806, 807, 810, 820 through 823, 826 through 828, 831, 835, 838, 840, 886 through 889 or 898 through 955.

                     b. If one or more of the installed PCUs has a serial number in the above range without a suffix "A", proceed to Requirement 2 of this AD.

                Note 1:  Suffix "A" after the S/N indicates that the PCU has already passed a magnetic particle inspection and is cleared for continued use.

                   2. Perform a daily check for the correct operation of all installed elevator PCUs.

                Note 2:  Requirement 2 of this AD is only applicable if required by Requirement 1.b.) of this AD.

                Note 3:  Requirement 2 of this AD is no longer required following accomplishment of Requirement 3 of this AD.

                Note 4:  Requirement 2 of this AD can be achieved by accomplishment of the procedures detailed in Appendix A, B or C of Bombardier Q400 All Operator Message No. 217B, dated 26 April 2007.

                     3. a. Remove all elevator PCUs that have S/Ns listed in Requirement 1.a.) of this AD and do not have suffix "A" after the S/N.

                     b. Replace each removed PCU with a PCU, P/N 390600-1007, which has a S/N outside the range listed in Requirement 1a) of this AD or has suffix "A" after the S/N.

             Note 5:  Bombardier Service Bulletin (SB) 84-27-32, Revision A, dated 18 January 2008, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, provides approved instructions for the removal and replacement of the PCUs and for