WATER STORAGE AND DISTRIBUTION -FORWARD DRAIN AND AFT SERVICE PANELS
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WATER STORAGE AND DISTRIBUTION -FORWARD DRAIN AND AFT SERVICE PANELS
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777 AIRCRAFT MAINTENANCE MANUAL
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WATER STORAGE AND DISTRIBUTION -WATER TANK
Purpose
There are two water tanks to hold potable water.
Physical Description
Each water tank has a capacity of 120 gallons (454 liters). There is a standpipe that limits the amount of water in each tank to 109 gallons (413 liters).
The water tanks have these components:
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Access panel (2)
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Water tank shear pin fitting
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Tie rod hole (4)
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Water tank pressure connection
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Water overflow connection
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Water fill connection
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Water tank rotation support hole (2)
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Water level sensor (internal)
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Water distribution and drain connection.
Location
The water tanks are aft of the bulk cargo compartment end wall.
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WATER STORAGE AND DISTRIBUTION -WATER TANK
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WATER STORAGE AND DISTRIBUTION -WATER TANK SUPPORT SHEAR FITTING
Purpose
The water tank support shear fitting holds the water tank shear pin. The shear pin holds the water tank in place during forward loads.
Physical Description
The fitting has four mounting holes.
Location
The fitting is installed above the water tank. It attaches to the floor beams with four bolts.
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WATER STORAGE AND DISTRIBUTION -WATER TANK SUPPORT SHEAR FITTING
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WATER STORAGE AND DISTRIBUTION -FILL/OVERFLOW VALVE AND CONTROL CABLE
Purpose
The fill/overflow valve has these functions:
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Lets water flow into the potable water tanks from the aft potable water service panel
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Lets the air in the water tanks vent overboard as water flows into the tanks
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Lets water flow overboard when the tanks are full
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Does not let the air compressor operate when the valve is in the open position.
Physical Description
The valve has:
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A cable connection to the aft service panel
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Four water line connections
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An interlock switch for the tank pressurization compressor.
Location
The fill/overflow valve is behind the bulk cargo compartment end wall. It is above and outboard of the outboard water tank. The valve attaches to the passenger compartment floor structure with four bolts.
Functional Description
To open the valve you pull out on the handle. Water flows from the service panel to the outboard tank. Some of the water flows from the outboard tank to the inboard tank through the water distribution line. This connection lets both tanks fill at the same time. A vent line that does not go through the valve connects the standpipe of the outboard tank to the top of the inboard tank. When the outboard tank is full, water flows through this line to the inboard tank. When the inboard tank is full, the water flows through the valve, then overboard. Push the control handle in to close the valve.
When the valve is in the closed position, the fill line from the service panel connects to the overboard line.
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WATER STORAGE AND DISTRIBUTION -FILL/OVERFLOW VALVE AND CONTROL CABLE
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WATER STORAGE AND DISTRIBUTION -DRAIN VALVE AND CONTROL CABLE
Purpose
The two drain valves let water drain overboard from the overhead water distribution line, the galleys, and the lavatories.
Physical Description
The two system drain valves are identical and interchangeable. The valve has two positions: open and closed.
The valves are a single-ball type of valve. The valves have these parts:
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