Document ID: chunk:federal_register_of_legislation:F2006B03176:body:0:p3
Version: federal_register_of_legislation:F2006B03176
Segment Type: other
Provision Reference: 
Character Range: 6032–8973

the stator lead wire bundle. This occurred when the stationary wire bundle came into contact with the rotor in the pump motor. The pumps failed when the pump power was short-circuited to the rotor and the circuit protection device tripped.

           Examination of failed pumps showed that arcing had occurred in the pump bearings both inside and outside of the explosion-proof cavity of the pump. Such arcing could result in an ignition source in the fuel tank. The fuel pump failures have been attributed to the manufacturing assembly process during which the stator lead wire bundle was improperly installed and positioned in the end cap.

           This Directive supersedes AD/B747/279 Amdt 1, which is cancelled. This Directive requires an amendment to the AFM which is intended to ensure that the centre wing tank pump inlets are covered with fuel during pump operation, preventing fuel vapours from coming into contact with any ignition source resulting from a fuel pump failure and installation of placards advising that fuel usage restrictions apply. The Directive also provides optional terminating action for Requirements 2 and 3.

 Barry James Reid McKay
 Delegate of the Civil Aviation Safety Authority 2 October 2002

 The above AD is notified in the Commonwealth of Australia Gazette on 3 October 2002.

AD/B747/280

Annex A

                              Fuel Tank Pumps 12/2002 TX

       Model 747-100, -200B, -200F, -200C, -100B, -300, -100B SUD, 747SR, and 747SP
                       Series Aeroplanes Aircraft Flight Manual Revision

 Certificate Limitations

 Fuelling and use of the centre auxiliary fuel tank and auxiliary fuel tanks 1 and 4 (if installed) is prohibited.

 The centre wing tank (CWT) must contain a minimum of 17,000 pounds (7,700 kilograms) of fuel prior to engine start, if the CWT override/jettison pumps are to be selected ON during flight.

 The CWT fuel quantity indication system must be operative to dispatch with CWT mission fuel.

 Both CWT override/jettison pump switches must be selected OFF at or before the CWT fuel quantity reaches 7,000 pounds (3,200 kilograms), if the CWT fuel quantity is less than 50,000 pounds (22,700 kilograms) prior to engine start. The CWT override pumps may be selected ON during stabilized cruise conditions. Both CWT override/jettison pump switches must be selected OFF at or before the CWT fuel quantity reaches 3,000 pounds (1,400 kilograms).

 Both CWT override/jettison pump switches must be selected OFF at or before the CWT fuel quantity reaches 3,000 pounds (1,400 kilograms), if the CWT fuel quantity is greater than or equal to 50,000 pounds (22,700 kilograms) prior to engine start.

 Both CWT override/jettison pumps must be selected OFF when either CWT override/jettison fuel pump low pressure light illuminates.

 Warning: Do not reset a tripped fuel pump circuit breaker.

        Warning: Do not cycle the CWT pump switches from