LANDSCAPE CAMERA WINDOW HEAT -INTRODUCTION

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LANDSCAPE CAMERA WINDOW HEAT -FUNCTIONAL DESCRIPTION

General
The window heat switch for the left forward flight compartment window enables the landscape camera window heat.
See the flight compartment window anti-ice section for more information about the flight compartment window heat (SECTION 30-41).
When the airplane is in the air, the heater gets 115v ac power. When the airplane is on the ground, a transformer supplies 75v ac power.
The temperature switch opens when the temperature of the window is more than 82F (28C).
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LANDSCAPE CAMERA WINDOW HEAT -FUNCTIONAL DESCRIPTION

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777 AIRCRAFT MAINTENANCE MANUAL

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30-71-00

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

DRAIN AND WATER SUPPLY LINE HEATING -INTRODUCTION

Purpose
Electric heaters prevent ice in the water and waste systems.
General Description
These heaters are in the potable water system:
*
Water supply line heaters

*
Water tank drain hose heater. These heaters are in the waste system:

*
Waste drain line heaters

*
Waste tank rinse fitting heaters. These heaters are in the gray water drain system:

*
Drain mast heaters

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Gray water drain line hose heater

*
Water drain line heaters.

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DRAIN AND WATER SUPPLY LINE HEATING -INTRODUCTION

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DRAIN AND WATER SUPPLY LINE HEATING -WATER SUPPLY IN-LINE HEATER -INTRODUCTION

General
Water lines carry water from the potable water tanks to the lavatories and galleys.
Each water line has a water supply in-line heater, controller and thermostat.
Some heaters have remote thermostats. The heaters and the remote thermostats are LRUs. Each LRU has an electrical connector.
One heater has an integral thermostat in the controller. This thermostat is not a separate LRU.
Location
The water supply in-line heaters are near the potable water tanks. Access to the heaters is through the end wall of the bulk cargo compartment.
Training Information Point
It is not necessary to splice the wires when you replace an LRU.
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DRAIN AND WATER SUPPLY LINE HEATING -WATER SUPPLY IN-LINE HEATER -INTRODUCTION

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DRAIN AND WATER SUPPLY LINE HEATING -WATER SUPPLY IN-LINE HEATER -FUNC. DESC.

General
The heaters in the distribution lines have remote thermostats. The heater below the outboard potable water tank has an integral thermostat in the controller. The heaters operate the same.
Functional Description
The thermostat supplies electrical continuity as temperature decreases below freezing. As temperature increases, the thermostat stops continuity to prevent too much heat. The thermostat stops continuity when the temperature is greater than 60F (15C). Continuity comes back when the temperature is less than 45F (7C).
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DRAIN AND WATER SUPPLY LINE HEATING -WATER SUPPLY IN-LINE HEATER -FUNC. DESC.

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DRAIN AND WATER SUPPLY LINE HEATING -WATER TANK DRAIN HEATER

General
The drain line for the potable water tanks has an integral water tank drain heater. The heater prevents freezing in the line. This heated hose is an LRU.
The heater wires on the heated hose do not have electrical connectors. You must splice the wires when you replace a drain hose.
Location
The heated hose is below the potable water tanks. Removable panels supply access to the hose through the aft cargo compartment.
Functional Description
The heated hose has an integral thermostat. The thermostat supplies electrical continuity as temperature decreases below the freeze point. As temperature increases, the thermostat opens the circuit to prevent too much heat. The thermostat opens the circuit when the temperature is greater than 50F (10C). The thermostat closes the circuit when the temperature is less than 50F (10C).
　
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