COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/85 Fuel Actuator Shutoff Valve 6/95 Applicability: All model 737 series aircraft fitted with J.C. Carter actuator P/N 40574-2 used in any of the following J.C. Carter fuel system valves. J.C Carter P/N Boeing P/N 6563 10-60529-1 60128 10-60529-5 61163 10-60529-8 61183 10-60529-10 61185 10-60529-11 Note: The above valve assemblies are used on the 737 fuel shutoff and crossfeed positions. Requirement: Action in accordance with J.C. Carter SB 61163-28-08. Compliance: By 31 May 1997. Background: The valve manufacturer has advised that while functional testing a Boeing 737 gate valve, when the valve was selected to either the "open" or "close" position the actuator suffered a clutch slippage problem whenever the temperature dropped below minus twenty degrees C (minus five degrees F).