Document ID: chunk:federal_register_of_legislation:F2006B03178:body:0:p2
Version: federal_register_of_legislation:F2006B03178
Segment Type: other
Provision Reference: 
Character Range: 3000–6161

fuel situation, both CWT override/jettison pumps may be selected ON and all CWT fuel may be used.

                If a centre wing tank pump fails with fuel in the centre tank, shut off the affected fuel pump.

                If the main tanks are not full, the zero fuel gross weight of the aeroplane plus the weight of CWT tank fuel may exceed the maximum zero fuel gross weight by up to 7,000 pounds (3,200 kilograms) for takeoff, climb, cruise, descent, and landing, provided that the effects of balance (CG) have been considered.

                When defueling centre or main wing tanks, the Fuel Pump Low Pressure indication lights must be monitored and the fuel pumps positioned to OFF at the first indication of fuel pump low pressure. Defueling with passengers on board is prohibited.

                Model 747-400, -400D, and -400F CERTIFICATE LIMITATIONS
                Fueling and use of the horizontal stabilizer tank (if installed) is prohibited.

                The centre wing tank (CWT) must contain a minimum of 17,000 pounds (7,700 kilograms) 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 CWT fuel quantity reaches 7,000 pounds (3,200 kilograms), if 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).

                    Note

                    With CWT override/jettison pumps selected OFF and CWT fuel quantity greater than 6,000 pounds (2,800 kilograms), the FUEL OVRD CTR L & R EICAS messages will be displayed. Do not accomplish the associated non- normal procedure.

                Both CWT override/jettison pump switches must be selected OFF at or before CWT fuel quantity reaches 3,000 pounds (1,400 kilograms), if 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 CWT override/jettison pump switches from ON to OFF to ON with any continuous low pressure indication present.

                    Note

                    The centre wing tank may be emptied normally during an emergency fuel jettison.

                    Note

                    In a low fuel situation, both CWT override/jettison pumps may be selected ON and all CWT fuel may be used.

                    If a centre wing tank pump fails with fuel in the centre tank, accomplish the FUEL OVRD CTR L, R non- normal procedure.

                If the main tanks are not