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When the passenger cabin signs illuminate or extinguish, a low tone sounds over the PA system.
Emergency Lighting
Exit lights are located throughout the passenger cabin to indicate the approved emergency exit routes. The system is controlled by a switch on the overhead panel. The switch has three positions, OFF, ARMED and ON and is guarded to the ARMED position. With the switch in the ARMED position, the emergency exit lights are normally extinguished. If electrical power to DC bus No. 1 fails or if AC power has been turned off, the emergency exit lights illuminate automatically.
The emergency exit lights may also be illuminated by a switch on the aft attendants panel. Lifting the guard and pushing the switch ON overrides the flight deck control and illuminates the emergency exit lights. Control from this panel is available in the event of failure of the automatic control.
The flight deck aft DOME light contains a separate bulb that is powered by the emergency lighting system to provide for flight deck evacuation.
Copyright . The Boeing Company. See title page for details.
1.40.4  June 1, 2005

Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Flight Crew Operations Manual
Interior Emergency Lighting YA613 - YA803, YC153 - YC413
Interior emergency exit lights are located:
.  
in the lower inboard corner of stowage bins to illuminate the aisle

.  over the entry/service and overwing emergency hatches to indicate the
door and hatch exits

.  
in the ceiling to locate the exits and provide general illumination in the

area of the exits. Self–illuminating exit locator signs are installed at the forward, middle, and aft end of the passenger cabin.
Floor proximity emergency escape path lighting consists of locator lights spaced at regular intervals down one side of the aisle. Lighted arrows point to overwing exits and a lighted EXIT indicator is near the floor by each door and overwing exit. Escape path markings are provided for visual guidance for emergency cabin evacuation when other sources of cabin lighting are obscured.
Interior Emergency Lighting YA809, YD651 - YK104
Interior emergency exit lights are located:
.  
in the lower inboard corner of stowage bins to illuminate the aisle

.  over the entry/service and overwing emergency hatches to indicate the
door and hatch exits

.  
in the ceiling to locate the exits and provide general illumination in the
area of the exits.

 

Self–illuminating exit locator signs are installed at the forward, middle, and aft end of the passenger cabin.
A photoluminescent floor path marking system is installed along the cabin aisle. The photoluminescent material, when excited by light, will glow and provide exit path guidance. At the exit, electrically operated lights and markers provide exit identification.
The photoluminescent strips need to be properly charged. The table below contains charging information and can be used to determine how long the strips remain illuminated. For charging, the cabin ceiling, and sidewall lights need to be on at full intensity, and the strips should not be covered or blocked.
Copyright . The Boeing Company. See title page for details.
Airplane General, Emergency Equipment, Doors, Windows -Systems Description 737 Flight Crew Operations Manual

Charge Scenario  Photoluminescent Duration (Hours)  Remarks 
First flight of the day - bins 
closed, no passengers 
. 5 minute charge  .4.25  Close overhead bins during 
. 10 minute charge  .8  charging and cabin activity is 
. 15 minute charge . 30 minute charge  .9.5 .14  limited to minor aisle traffic of crew and personnel. Passengers will shadow the system and are 
. 45 minute charge  .16  not allowed on board during charging. 
First flight of the day - bins open, no passengers . 15 minute charge . 30 minute charge  .5.75 .7.5  Cabin activity is limited to minor aisle traffic of crew and personnel. Passengers will shadow the system and are not allowed on board during charging. 
Photoluminescent duration can be extended beyond the initial charge, by using the following charge scenarios: 
In flight/taxi - with cabin lighting on  No limit with ceiling lights on dim or greater 
In flight/taxi - with cabin lighting off . 15 minute charge . 30 minute charge  .8 . 11.25  Begin charging prior to previous discharge duration ending. 

Copyright . The Boeing Company. See title page for details.
1.40.6  March 15, 2002

Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Flight Crew Operations Manual
　
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