Document ID: chunk:federal_register_of_legislation:F2006B03255:body:0
Version: federal_register_of_legislation:F2006B03255
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Boeing 747 Series Aeroplanes

AD/B747/77 APU Fire Detection 5/90

            Applicability: All model Boeing 747-400 series aeroplanes as listed in Boeing SB 747-26-2135 Revision 1, or later revision.

            Requirement: Modify the APU electrical power circuitry in accordance with Boeing SB 747-26- 2135 Revision 1 or later revision.

 Compliance: Prior to 17 August 1990.

            Background: In the current configuration if the main battery switch is turned off whilst the APU is operating, power to the APU fire detection system is removed. The APU goes through a 60 second cool down cycle with the fire detection system inoperative.
            Compliance with this AD is required to correct this unacceptable condition.