AD/B747/80 - Equipment Cooling System E30 Cooling Rack Orifice

Administered by Department of Infrastructure, Transport, Regional Development, Communications, Sport and the Arts

Legislation au F2006B03258 Not in force Legislative Instrument

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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/B747/80 Equipment Cooling System E30 Cooling Rack Orifice

Applicability: All Boeing 747-400 as detailed in the Requirement document. Requirement:  Action in accordance with Boeing Alert Service Bulletin 747-21A2285. Compliance:               Prior to 6 December 1990.


9/90

Background: One operator has reported three instances of insufficient equipment cooling system pressure in the E30 rack. Lack of sufficient cooling may cause overheating of the main transformer rectifier units resulting in no DC power output from the main TRU’s. Whilst limited DC power will still be available from the main battery and battery charger, loss of output from the main TRU’s will result in loss of many flight essential systems.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.