EMERGENCY LIGHTING -SLIDE LIGHTS -GENERAL DESCRIPTION
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EMERGENCY LIGHTING -POWER SUPPLIES -INTRODUCTION
Purpose
The power supplies for the emergency lighting system have these functions:
*
Controls the rate of charge for its batteries
*
Controls when the emergency lights turn on and off
*
Controls the selection of airplane power or its batteries to operate the emergency lights.
Location
The power supplies are in the ceiling, above the passenger entry doors. There can be 2, 3, or 4 power supplies at each door.
Power supplies at doors 1 and 4 attach to the upper side of the overdoor panel.
Power supplies attach to the strong back assembly above the overdoor panel at these doors:
* 2
* 3.
The strong back assembly is related to the outboard stowage bin. See the passenger compartment section for more information about the outboard stowage bins (SECTION 25-20).
Physical Description
The power supplies weigh 2.8 pounds (1.3 kg). They supply 6v dc to the emergency lights.
Each power supply has these parts:
*
Test switch
*
Charger/control unit
*
Battery pack
*
Fuse (4)
*
Quick release fastener (2)
*
Electrical connector (battery pack)
*
Base
*
Electrical connector (airplane).
The fuses and the battery pack are replaceable. The fuses attach to the base under the battery pack. The battery pack attaches to the base with two quick release fasteners. When fully charged, the battery pack provides power for a minimum of 15 minutes.
Training Information Point
The power supplies give power to the lights that are in the same airplane section as the power supplies. They are all the same and interchangeable. They continuously self-charge (L or R main dc buses). If the batteries discharge, they do a fast charge. It takes approximately 90 minutes for a fast charge.
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EMERGENCY LIGHTING -POWER SUPPLIES -INTRODUCTION
EFFECTIVITY BEJ ALL 33-50-00
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D633W101-BEJ Jan 05/2002
EMERGENCY LIGHTING -OPERATION
Operation
You use the emergency lights switch in the flight deck or on the P89 attendant switch panel (ASP) to operate (control) the emergency lights.
Either switch turns on the lights. The switch used to turn on the lights must be used to turn off the lights. The OFF position of the flight deck switch does not affect the function of the switch on the ASP.
In normal operation, the switch in the flight deck is in the ARMED position. The ARMED position lets all lights come on if there is no electrical power on the left and right main dc buses.
The ARMED position also lets a limited number of lights come on when a passenger entry door is opened in the auto mode.
To do a test of the lights, you use the test switches on these components:
*
P89 attendant switch panel at door 2 left
*
P94 attendant switch panel at door 4 right (not shown)
*
P40 service and APU shutdown panel
*
Power supply.
The emergency lights come on for one minute.
Training Information Point
When you push the test switch on the power supply, only the emergency lights that connect to that power supply come on. When you use the test switch on one of the attendant switch panel or on the P40, all emergency lights come on.
Make sure that the test switches return to their usual position when you release them. The usual position for the test switches on the ASPs is out. If a switch is in the test (in) position, red LEDs inside the switch come on. The test switch on the P40 has labels that show the TEST and NORM (usual) positions. If any test switch does not return to its usual position, the battery packs can discharge fully.
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777 AIRCRAFT MAINTENANCE MANUAL
EMERGENCY LIGHTING -OPERATION
EFFECTIVITY BEJ ALL 33-50-00
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EMERGENCY LIGHTING -FUNCTIONAL DESCRIPTION -POWER
General
There are six separate emergency light circuits. Each circuit has one circuit breaker on the P11 overhead circuit breaker panel. Three circuit breakers get power from the left main dc bus. These circuit breakers give 28v dc to the power supplies above passenger entry doors 1 and 2. The other three circuit breakers get power from the right main dc bus. These circuit breakers give 28v dc to the power supplies above passenger entry doors 3 and 4.
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