Document ID: chunk:federal_register_of_legislation:F2009L03768:body:0:p1
Version: federal_register_of_legislation:F2009L03768
Segment Type: other
Provision Reference: 
Character Range: 0–3339

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.

Avions de Transport Regional ATR 42 Series Aeroplanes
AD/ATR 42/27  Multi Purpose Computer with Aircraft Performance Monitoring Function  11/2009

Applicability:  Model ATR 42-200, 42-300 and 42-320 aeroplanes that are not already equipped with Multi Purpose Computer / Aircraft Performance Monitoring (MPC/APM) per ATR Mod 08420 (Service Bulletin (SB) ATR42-31-0071), and Model ATR42-400 and
                42-500 aeroplanes that are not already equipped with MPC/APM per ATR Mod 05567 or by retrofit through SB ATR42-31-0068.
Requirement:    Unless previously accomplished, install a Multi Purpose Computer (MPC) with Aircraft Performance Monitoring (APM) in accordance with the accomplishment instructions of:

                       * SB ATR42-31-0071 Revision 07 dated 7 February 2008 (Mod 008420) for ATR42-200/300/320 aeroplanes.

                       * SB ATR42-31-0068 Revision 07 dated 15 January 2009 (Mod 05567) for ATR42-400/500 aeroplanes.
                Installation of a MPC/APM accomplished before the effective date of this Directive in accordance with earlier revisions of the aforementioned SBs, satisfy the requirements of this Directive.
                Later revisions of the aforementioned SBs approved by the European Aviation Safety Agency (EASA) are acceptable for compliance with this Directive.
                Note 1:  Mod 05567 was factory-incorporated onto ATR 42-500 aeroplanes from Manufacturer Serial Number (MSN) 641.
                Note 2:  At the effective date of this Directive, Appendix 15 to the Aircraft Flight Manual (AFM) which describes the specific procedures associated with the APM is included in the following Normal Revision of the applicable AFM:

                     - AFM 42-200/300/320 Normal Revision 27 dated April 2008.

                     - AFM 42-400/500 Normal Revision 13 dated October 2008.
                Note 3:  EASA AD 2009-0170 refers.

Compliance:  Not later than the second "C" check or within 72 months, whichever occurs first after the effective date of this Directive.
             This Airworthiness Directive becomes effective on 22 October 2009.
Background:  This Directive is intended to minimize hazards on ATR42 aeroplanes associated with the inadvertent encounter of severe icing conditions (which are beyond current certification envelope requisites for Part 25 aeroplanes) by providing the flight crew with measurable and objective evidence and timely alert when such severe ice conditions are encountered.
             The accumulated experience on the worldwide fleet of commuter aeroplanes together with recently reported ATR42/72 in-flight incidents, show that a