*
Increase or decrease the fuel to remain with the FUEL TO REMAIN selector
*
Push the NOZZLE switches to open the jettison nozzle valves, start the jettison pumps, and open the jettison isolation valves
*
Turn off the NOZZLE switches when the EICAS display shows the jettison complete advisory message
*
Turn off the ARM switch.
When you arm the jettison system, it is in the maximum landing weight mode. In this mode, the jettison system automatically sets the quantity of fuel to remain that will make the airplane weight equal to the maximum landing weight.
If you pull the FUEL TO REMAIN selector, the jettison system changes to the manual mode. Then you turn the FUEL TO REMAIN selector to change the quantity of fuel to remain. Turn the selector left to decrease or right to increase the fuel to remain.
You use the override/jettison pump switches to control the center tank override/jettison pumps. The jettison system does not control the override/jettison pumps.
The fuel jettison rate with one nozzle valve open is 2700 lbs/min (1224 kg/min) with the operation of the jettison pumps only, and 3500 lbs/min (1587 kg/min) with the jettison and the override/ jettison pumps.
The fuel jettison rate with two nozzle valves open is 3100 lbs/ min (1406 kg/min) with the operation of the jettison pumps only, and 5400 lbs/min (2449 kg/min) with the jettison and the override/jettison pumps.
Indications
The EICAS display shows these jettison system indications:
*
Total fuel quantity
*
Fuel to remain
*
Jettison mode.
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FUEL JETTISON -OPERATION
The jettison mode shows adjacent to the fuel to remain quantity. MLW shows if the jettison system is in the maximum landing weight mode. MAN shows if the jettison system is in the manual mode.
The fuel synoptic display shows these jettison system indications:
*
Override/jettison pump operation
*
Jettison isolation valve position
*
Jettison pump operation
*
Jettison nozzle valve position
*
Fuel to remain
*
Jettison mode
*
Time until jettison complete.
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777 AIRCRAFT MAINTENANCE MANUAL
FUEL JETTISON -OPERATION
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FUEL INDICATING -INTRODUCTION
General
The fuel indicating system has these subsystems:
*
Fuel quantity indicating system
*
Fuel measuring sticks
*
Fuel temperature indicating
*
Fuel pressure indicating.
Fuel Quantity Indicating System (FQIS)
The FQIS measures fuel quantity in the tanks. The primary display system (PDS) and the IRP indicators show fuel quantity.
Fuel Measuring Sticks
The fuel measuring sticks permit you to manually measure fuel quantity in each tank.
Fuel Temperature Indicating System
The fuel temperature indicating system measures the fuel temperature in the left main tank. The PDS shows the temperature.
Fuel Pressure Indicating System
The fuel pressure indicating system shows low pressure at the fuel pump outlets. See the engine fuel feed section for more information about fuel pressure indicating (SECTION 28-22).
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FUEL INDICATING -INTRODUCTION
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FUEL INDICATING -FQIS -GENERAL DESCRIPTION
General Fuel weights go to the IRP on ARINC 429. Fuel weights, and
FQIS data and fault information go to the AIMS on the systems The fuel quantity indicating system (FQIS) does these functions:
ARINC 629 buses.
*
Measures the fuel volume
*
Calculates the fuel quantity
*
Controls refuel operations
*
Shows when there is water in the tanks.
These are the FQIS components:
*
Tank units
*
Densitometers
*
Water detectors
*
Fuel temperature sensor
*
Wiring harnesses
*
Fuel quantity processor unit (FQPU).
Operation
The FQPU sends signals to and gets signals from the fuel tank sensors. The FQPU uses the signals to calculate these data:
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