AD/A320/174 Amdt 2 - Air Data/Inertial Reference Unit (Cth)

AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/A320/174 Amdt 1 and issues the following 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/A320/174 Amdt 2 Air Data/Inertial Reference Unit 6/2012

Applicability: Model A318, A319, A320 and A321 series aeroplanes, all serial numbers, equipped with at least one Northrop-Grumman (previously Litton) Air Data/Inertial Reference Unit (ADIRU) with part numbers (P/N) listed in Table 1, except aeroplanes equipped with three ADIRUs P/N 465020-0303-0316 (installed by Airbus modification 35517 or Airbus Service Bulletin (SB) A320-34-1350 dated 20 March 2006) and that have modified the shelf as per Airbus modification 30650 or 30872 or SB A320-25-1248 dated 16 February 2001. Table 1 - List of Affected ADIRU P/N

465020-0303-0307 465020-0303-0312 465020-0303-0316 465020-0303-0308 465020-0303-0314 465020-0303-0309 465020-0303-0315

Note 1. These P/N ADIRUs were introduced during production by Airbus modification 24852 or 25108 or 25336 or 26002 or 28218 or 31070 or 31742 or 35517. Requirement: 1. For all aircraft - Operational dispatch of the aircraft with one ADIRU inoperative will be authorised under the following conditions: