Document ID: chunk:federal_register_of_legislation:F2006B03201:body:0:p2
Version: federal_register_of_legislation:F2006B03201
Segment Type: other
Provision Reference: 
Character Range: 3206–6226

EIUs in the main equipment centre with improved EIUs and installing new software in six IDUs and three EIUs.

 Installing new software in six IDUs and three EIUs.

 Replacing three EIUs with improved EIUs and installing new software in six IDUs and three EIUs.

 Replacing certain central maintenance computers (CMCs) with improved CMCs, modifying related wiring, and modifying the data loader control panel.

 Installing new software in the CMC.

 Installing new software in six IDUs and three EIUs.

  According to the Accomplishment Instructions of Boeing SB

   747-31-2179

   747-31-2180

   747-31-2217

   747-31-2178

   747-45-2005

   747-45-2010

   747-31-2163

4.         Parts listed in the "Existing Part Number" column under paragraph II.D. of the following Boeing SBs may not be installed on any aeroplane as a replacement part:

747-31-2163       747-31-2179  747-45-2005
747-31-2178       747-31-2180  747-45-2010

            Note 3: FAA AD 2004-10-05 Amdt39-13635 refers.

            Compliance:  For Requirement 1: For aeroplanes without three ADCs - Within 18 months after the effective date of this Directive, if Requirement 2 is not complied with, within 24 months after the effective date of this Directive.

            For aeroplanes with three ADCs - This Requirement is not applicable.

            For Requirement 2: For aeroplanes that have compiled with Requirement 1 - Within 72 months after the effective date of this Directive.

            For aeroplanes that have not complied with Requirement 1 and aeroplane that have three ADCs - Within 24 months after the effective date of this Directive.

            For Requirement 3 - Prior to or concurrently with Requirement 2. For Requirement 4 - As of the effective date of this Directive.
            This Airworthiness Directive becomes effective on 5 August 2004.

            Background: This Directive requires a modification of the ADC system, which involves installing certain new circuit breakers, relays, and related components, and making various wiring changes in and between the flight deck and main equipment centre. For certain aeroplanes, this amendment also requires accomplishment of various other actions prior to, or concurrently with, the modification of the ADC system. For some aeroplanes, this Directive also contains an option that will extend the compliance time to accomplish the modification of the ADC system.

            These actions are necessary to ensure that the flight crew is able to silence an erroneous overspeed or stall aural warning. A persistent erroneous warning could confuse and distract the flight crew and lead to an increase in the flight crews workload. Such a situation could lead the flight crew to act on hazardously misleading information, which could result in loss of control of the aeroplane.

 James Coyne
 Delegate of the Civil Aviation Safety Authority 23 June 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.