Federal Register of Legislation
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.
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