Document ID: chunk:federal_register_of_legislation:F2005L01952:body:0:p2
Version: federal_register_of_legislation:F2005L01952
Segment Type: other
Provision Reference: 
Character Range: 2922–7428

readout comparison to ensure that the applicable software is used; replacing the existing EICAS computers with new, improved EICAS computers that can be upgraded with certain software together with making related wiring changes.
                  767-31-0091 Revision 3 dated 27 April 2000
                 767-31-0098 Revision 2 dated 21 October 1999
                 767-31-0099 Revision 3 dated 8 February 2001
                 767-31-0100 Revision 2 dated 29 July 1999
                 767-31-0101 dated 6 July 2000
             Note 2:  The Boeing service bulletins listed above all include Appendices A, B and C,
                3. Parts listed in the "Existing Part Number" column under paragraph 2.E. of the following Boeing SBs shall not be installed on any aeroplane as a replacement part:
                  767-31-0091 Rev 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              767-31-0099 Rev 3  767-31-0101 Original
                 767-31-0098 Rev 2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               767-31-0100 Rev 2
             Note 3:  FAA AD 2004-10-05 Amdt 39-13635 refers.
Compliance:  For Requirement 1.a. - Remains unchanged as 'Within 24 months after the effective date of Amendment 1 to this Directive'.
             For Requirement 1.b.(i) - Remains unchanged as 'Within 18 months after the effective date of Amendment 1 to this Directive'.
             For Requirement 1.b.(ii) - Remains unchanged as 'Within 72 months after the effective date of Amendment 1 to this Directive'.
             For Requirement 2 - Prior to, or concurrently with, SB 767-34A0332, Revision 1 or Revision 2.
             For Requirement 3 - As of the effective date of the original issue of this Directive.
             This Amendment becomes effective on 15 July 2005.

Background:  The original issue of this Directive required 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 required accomplishment of various other actions prior to, or concurrently with, the modification of the ADC system.  For some aeroplanes, this Directive also contained an option that extended the compliance time to accomplish the modification of the ADC system.
             These actions were considered 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.
             Amendment 1, whilst continuing the requirements of the original issue of the Directive, clarified the optional methods of complying with Requirement 1.
             Amendment 2 introduced ASB 767-34A0332 Revision 2 as an alternate method of compliance and corrects a typographical error in Note 1.  The Amendment also changed applicability of the Directive by the deletion of four aeroplanes and the inclusion of two additional aeroplanes.
             This Amendment