AD/ATR 42/23 - Rear Pressure Bulkhead Area - Electrical Wire Chafing (Cth)

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 42/23 Rear Pressure Bulkhead Area - Electrical 6/2008 DM Wire Chafing

Applicability: ATR 42 model aeroplanes, all serial numbers, as follows ATR 42-200, 42-300 and 42-320 that have embodied ATR modification (Mod) 00639, except aircraft which have received ATR Service Bulletin (SB) ATR42-92-0018 whilst in service. ATR 42-400 and 42-500, except aeroplanes that have embodied ATR Mod 05780 during production or ATR SB ATR42-92-0018 whilst in service. Note 1: Mod 00639 has been embodied on production aircraft Manufacturer Serial Number (MSN) 109 and MSN 113 and was factory-incorporated from MSN 116. Note 2: Mod 05780 is now factory-incorporated on ATR 42-500 from MSN 667. Requirement: 1. Perform a one-time inspection of the electrical routing in the rear baggage zone in accordance with the accomplishment instructions of SB ATR42-92-0015, dated 11 February 2008. 2. If ANY damage is found during the Requirement 1 inspection (chafing and/or contact between bundles of cables and the airframe structure): a. Contact and report the finding(s) to ATR (by means of the accomplishment form enclosed in SB ATR42-92-0015) to obtain an approved repair solution and perform the repair in accordance with the ATR instructions, and b. Modify the electrical routing and wire bundle protection in accordance with the accomplishment instruction of SB ATR42-92-0018, dated 11 February 2008. 3. If damage is not found during the Requirement 1 inspection: a. Report to ATR the result of inspection by using the form enclosed in SB ATR42-92-0015, and b. Modify the electrical routing and wire bundle protection in accordance with the accomplishment instruction of SB ATR42-92-0018.