6.  Operation
A.  Interior Emergency Lights (Fig. 1 and 2)
(1)  
Interior emergency lights consist of aisle lights located in stowage bin bullnose assemblies, exit signs, exit locator signs and a flight deck light. Emergency lighting comes on when power is lost and pilots' control switch is in ARMED position or when manually turned on. The power supply for the emergency lights contains a line replaceable battery pack, a charging circuit, and a control logic circuit. Power supplies are located in the area of each passenger door and emergency exit and in the aft passenger cabin.

(2)  
The EMER EXIT LIGHTS switch on P5 overhead panel is the primary control for the emergency lights. The switch is a guarded 3-position (ON/ARMED/OFF) toggle switch on the emergency lights control panel. The switch is guarded in the ARMED position. In this mode, emergency lights come on when power is lost. With the toggle switch in either ON or OFF, the lights are on or off respectively, and a ground is provided to illuminate the NOT ARMED annunciator light and activate the master caution.

(3)  
The EMER EXIT switch on P14 aft attendants' panel, when in the ON position, overrides the pilots' lighting control switch. Opening the guard and placing the switch to ON turns on all emergency lights. The attendant's switch is guarded in the NORM position.

(4)  
Power for the emergency light power supplies is the 28v dc bus No. 1 through a circuit breaker on P18-3 panel. The 28v dc is applied to the emergency light power supplies to power the charging and control circuits. The battery packs are trickle charged when the emergency lights control switch is in OFF or ARMED. Batteries have a useful life of at least 15 minutes under load and require 16 hours to fully recharge.

(5)  
Solid state logic controls the emergency lights and operates from 28v dc. Control is achieved by supplying 28v dc and ground inputs to the power supplies through the control and test switches. If all power is to be removed from the airplane, the pilots' EMER LIGHTS switch must be positioned to OFF. This prevents the emergency lights from turning on and discharging the batteries. The 28v dc input is not required to establish the off condition.

(6)  
Power supplies for all emergency lights are located in the passenger cabin. Power supplies can control up to 8 lights each.

B.  Exterior Emergency Lights
(1)  
Exterior emergency lights are flush mounted on the fuselage. Lights are aft of each passenger/service door and each emergency door. The lights illuminate the escape slides areas.

(2)  
Exterior emergency lights are controlled the same as the interior lights. Exterior lights are connected to the same power supplies as the interior lights.

5C9 
33-51-02 Page 2  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/86 

5C9 Emergency LightsFeb 20/84 Figure 1 33-51-02 Page 3/4BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

5C9  Emergency Lights Simplified Schematic 
Oct 20/83  Figure 2  33-51-02 
Page 5/6 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EMERGENCY LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
ATI INTERIOR
1.  General
A.  If the P14 aft attendants' panel is removed, the EMER LIGHTS switch on P5 overhead panel must be in OFF. A jumper wire must also be placed between pins 11 and 12 on connector D4250J at the aft attendant's panel. These steps prevent the emergency lights from turning on and discharging the power supply batteries. If the S7 emergency exit light switch is removed, 28 volts dc must be provided to the emergency light system to prevent battery discharge. The electrical wiring or connector to any emergency light or power supply can be disconnected without discharging the batteries.
Oct 20/84 33-51-02 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

EMERGENCY LIGHTS - ADJUSTMENT/TEST
EFFECTIVITY
ATI INTERIOR
1.  General
A.  This section contains procedures for performing an operational test and system test. No adjustments are required.
(1)  
The operational test procedure verifies proper operation of the exterior and interior emergency lights. This test takes a minimum of time and uses only equipment installed on the airplane.

(2)  
The system test verifies proper operation of the emergency light control switches, battery packs, and lights.

B.  The emergency lights to be tested are identified below.
　
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