AD/B747/280 - Fuel Tank Pumps
Model 747-100, -200B, -200F, -200C, -100Model 747-100, -200B, -200F, -200C, -100B, -300, -100B SUD, 747SR, and 747SP
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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 ON to OFF to ON with any continuous low pressure indication present.
Note: The CWT may be emptied normally in 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, 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.