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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 British Aerospace BAe 125 Series Aeroplanes

AD/HS 125/64 Audio Integrating System Wiring - Modification 4/84

 Applicability: All Hawker Siddeley HS-125 series listed in requirement document.

            Document: Hawker Siddeley HS-125 Service Bulletin No. 23-21-(8765) November 1983 (Revision 2).

            CAA AD No. 046-04-83 refers.

 Compliance: Before 31 May, 1984.

            Background:  A single failure in the electrical supply to the ESB31 and EA76 Audio integrating systems, can produce a complete failure of all aircraft audio systems. Modification involves segregation of power supplies.