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Interface
The power supplies connect to the circuit breakers either directly or through switches. The switches are part of the passenger entry door emergency power assist system (EPAS).
The emergency lighting circuit breakers give 28v dc to the EPAS battery packs. There is one battery pack for each passenger entry door. See the passenger entry doors section for more information on the EPAS (SECTION 52-11).
Direct Connection to Circuit Breaker
The power supplies that connect directly to the circuit breaker give power only for interior emergency lights. Interior emergency lights are organized by area and are connected to a power supply that can be on either side of the airplane. This is an example: a power supply above door 1 left gives power to interior lights on the left and right sides of the airplane near doors 1 left and right.
Connection to Circuit Breaker Through Switches in EPAS
The power supplies that connect to circuit breakers through switches give power only for the slide (exterior) light and interior emergency lights near the related door.
The switches in the EPAS give information about the passenger door (open/close and mode). Each passenger entry door has one set of switches. The switches connect one emergency light power supply to the circuit breaker. The mode select switch has an AUTO and a MANUAL position.
The mode select lever on the passenger entry door shows AUTO when the mode select switch is in AUTO and it shows MANUAL when the mode select switch is in MANUAL.
The power supply gives power only to the slide and the interior emergency lights on the same side of the airplane and near the door. This is an example: a power supply above door 1 left gives power to these lights:
*
Door 1 left slide light

*
Interior emergency lights on the left side of the airplane near door 1 left

*
Caption dome light.

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EMERGENCY LIGHTING -FUNCTIONAL DESCRIPTION -POWER

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777 AIRCRAFT MAINTENANCE MANUAL

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EMERGENCY LIGHTING -FUNCTIONAL DESCRIPTION -CONTROL

General
There are six separate emergency light circuits. All circuits are similar. A typical circuit is shown.
Functional Description
The emergency lights use power from the battery packs. The battery packs usually last for 15 minutes or more. All emergency lights (slide and interior) come on when any of these conditions occur:
*
The emergency lights switch in the flight deck (P5) is in the ARMED position and the related main dc bus does not have power (left main dc bus for power supplies above doors 1 and 2, right main dc bus for power supplies above doors 3 and 4)

*
The emergency lights switch in the flight deck (P5) is in the ON position

*
The emergency lights switch on the P89 attendant switch
panel (door 2L) is in the ON position.

 

When a passenger entry door is set to the automatic mode (mode select switch set to AUTO) and is open (door open switch) these lights come on:
*
The related slide light

*
The interior emergency lights, near and on the same side as the related passenger entry door.

The lights stay on until none of the above conditions is true or until the battery packs do not have sufficient charge.
EFFECTIVITY
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Test
You can find test switches for the emergency lights at these locations:
*
P89 attendant switch panel (door 2L)

*
P94 attendant switch panel (door 4R)

*
P40 nose gear electrical service panel.

When you push and release an emergency light test switch, all power supplies do a check of the condition of their battery pack. All emergency lights (slide and interior) related to power supplies with a good battery pack, come on for one minute.
When you push and release the test switch on a power supply, only the lights that connect to the power supply come on for one minute.
Indications
The advisory message EMER LIGHTS shows when any of these conditions occur:
*
Emergency lights switch (P5) is in the ON or OFF position

*
Emergency lights switch (P89) is in the ON position.

When the emergency lights switch on the attendants switch panel is in the ON position, a red light in the switch comes on.
There are no lights in the test switches.
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EMERGENCY LIGHTING -FUNCTIONAL DESCRIPTION -CONTROL

Training Information Point
When you do a test of the emergency lights, make sure you use a test switch and not one of the emergency lights switches.
　
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