Document ID: chunk:federal_register_of_legislation:F2006B02832:body:0:p3
Version: federal_register_of_legislation:F2006B02832
Segment Type: other
Provision Reference: 
Character Range: 5469–8498

replacement may be scheduled in accordance with the 737 MPD.

            For Requirement 3 - Remains unchanged as "Prior to 5 December 1999". For Requirement 3.a. - Before further flight.
            For Requirement 3.b. - At intervals not to exceed 600 hours time in service until Requirement 6 is accomplished or Boeing ASB 737-24A1136 or Revision 1 or Revision 2 is incorporated.

            For Requirement 4 - Remains unchanged "As of the effective date of the original issue of this Directive".

            For Requirement 5 - Within 90 days after the effective date of this Amendment, or within 750 hours time in service after the last battery replacement accomplished in accordance with Requirement 1.a., whichever occurs later. Thereafter, replace the aeroplane battery with a new or reconditioned aeroplane battery at intervals not to exceed 750 hours time in service unless ASB 737-24A1136 or Revision 1 or Revision 2 has been incorporated where replacement may be scheduled in accordance with the 737 MPD.

            For Requirement 6 - Within 90 days after 20 April 2000 (the effective date for Amendment 2), or within 90 days after accomplishment of the test required by Requirement 3, whichever occurs later (unless the "Alternative Test of Diode CR910", as specified in Boeing Telex Message M-7200-99-01528, was accomplished as compliance for Requirement 3).

            For Requirement 6.a. - At intervals not to exceed 600 hours time in service until Boeing ASB 737-24A1136 or Revision 1 or Revision 2 is incorporated.

            For Requirement 6.b. - Before further flight and thereafter, repeat the diode test at intervals not to exceed 600 flight hours until Boeing ASB 737-24A1136 or Revision 1 or Revision 2 is incorporated.

            This Amendment becomes effective on 28 October 2004.

            Background: The United States Federal Aviation Administration (FAA) issued AD 99-18-17 following an incident during which all electrical power was lost due to a combination of a weak or depleted battery and failure of a diode in the GCU.

            This Directive, whilst including the requirements of FAA AD 99-18-17, also includes the requirements of superseding FAA AD 99-24-08. The Directive requires repetitive replacement of the battery and, in certain cases, replacement of the GCU. The Directive also requires repetitive testing of a GCU diode. These actions are intended to prevent failure of all electrically powered systems in the aeroplane, which could result in an inability to continue safe flight and landing.

            This Amendment introduces optional service bulletins, which are considered terminating action for the repetitive diode testing and allows battery maintenance to be scheduled in accordance with the MPD.

            Amendment 3 clarified the requirements for use of the "Alternative Test of Diode CR910".

            Amendment 2 contained some minor formatting changes, introduced new requirements for some aeroplanes fitted with P/N 10-60701-3 battery