Document ID: chunk:federal_register_of_legislation:F2008L01245:body:0:p1
Version: federal_register_of_legislation:F2008L01245
Segment Type: other
Provision Reference: 
Character Range: 0–4520

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.

Airbus Industrie A319, A320 and A321 Series Aeroplanes
AD/A320/212  Braking and Steering Control Unit  5/2008

Applicability:  Aeroplane Models listed in Table 1 that are equipped with one conventional pre-Enhanced Manufacture and Maintainability (pre-EMM) Braking and Steering Control Unit (BSCU) part number (P/N):
                     a. C20216332292C (standard 7) installed by Airbus modification 24449 during production or by Airbus Service Bulletin (SB) A320-32-1124 whilst in service, or
                     b. C202163372D32 (standard 9) installed by modification 31106 during production or by SB A320-32-1227 or SB A320-32-1232 whilst service, or
                     c. C202163382D32 (standard 9.1) installed by modification 32500 during production or by SB A320-32-1254 whilst in service.
                Table 1
                A319-111                                                                                                                                                                                                                                       A319-131  A320-212  A320-232  A321-211
                A319-112                                                                                                                                                                                                                                       A319-132  A320-214  A320-233  A321-212
                A319-113                                                                                                                                                                                                                                       A319-133  A320-215  A321-111  A321-213
                A319-114                                                                                                                                                                                                                                       A320-111  A320-216  A321-112  A321-231
                A319-115                                                                                                                                                                                                                                       A320-211  A320-231  A321-131  A321-232
Requirement:       1. Modify or replace the BSCU in accordance with the instructions given in SB A320-32-1336, original issue, dated 19 September 2007, or later revision approved by the European Aviation Safety Agency (EASA) to install BSCU standard 10.
                   2. Remove Dunlop 46x16-20 tyres part numbers (P/N) 11659 T and 11661 T.
                   3. Dunlop 46x16-20 tyres P/N 11659 T and 11661 T may not be installed on any aeroplane equipped with a BSCU standard 10.
                Note:  EASA AD 2008-0048 refers.
Compliance:     For Requirement 1 - Before 30 September 2009.
                For Requirement 2 - Before further flight after accomplishing Requirement 1.

             For Requirement 3 - As of the effective date of this Directive.
             This Airworthiness Directive becomes effective on 8 May 2008.
Background:  The EASA has advised that during 2005 a lateral runway excursion occurred on an A320 aircraft.  Such excursions are classified as hazardous with a large reduction in safety margins.  Investigation has shown that the aircraft landed with the nose wheels rotated nearly 20 degrees from centre.  During subsequent tests on the removed BSCU, a BSCU hardware failure was found, affecting the monitoring function, including the system reconfiguration management, and leading to a runaway of nose wheel steering.

             AD/A320/27 (Direction Générale de l'Aviation Civile of France Airworthiness Directive F-1992-117-025(B) Revision 1), mandated the BSCU upgrade in order to improve the steering