(2)  
WDM 33-51-11 thru 33-51-99

 2.  Interior Emergency Lights_________________________
 A.  The interior emergency lights supply lighting to the passenger
 compartment and the flight compartment.

 (1)  
Aisle lights supply lighting to the aisle from the ceiling.

 (2)  
Exit signs show the passengers where the doors and escape hatches are. Each exit sign has a lens on the bottom surface which supplies lighting to the area below the sign.

 (a)  
There is an exit sign above each passenger door, service door, and overwing hatch.

 (b)  
There are also exit signs which point to the doors and hatches. These signs are installed above the aisle near the ceiling.

 (c)  
AIRPLANES WITH SELF-ILLUMINATED EXIT SIGNS; The lighting for each self-illuminated exit sign comes from a radioactive material. 1) These signs are always on. You cannot make these signs go

 off with the emergency lights switch. 2) Each sign is a plastic container that holds capsules filled with radioactive tritium gas.
 3)  The sign is safe, unless it is broken. If the sign has a hole or a crack in it, the radioactive gas can come out and cause injury to persons. It is dangerous to breathe the gas or to absorb the gas through the skin. There are special procedures to replace and discard these signs (AMM 33-51-41/201).
 (3)  AIRPLANES WITH FLOOR PROXIMITY EMERGENCY LIGHTS; Floor proximity emergency lights identify the aisle and the exits of the passenger compartment.
 (a)  A strip of aisle locator lights is installed on the floor along the aisle.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 (b)  An exit indicator sign is installed near the floor on the wall adjacent to each door and overwing hatch.
 (4)  The flight compartment emergency light is contained in the left dome light and is controlled with a switch on the overhead panel, P5.
 3.  Exterior Emergency Lights_________________________
 A.  Exterior emergency lights are 6-volt incandescent lights installed on the outer side of the airplane. These lights are pointed to supply lighting to the paths of deployed emergency evacuation slides.
 (1)  
There is one light near each door.

 (2)  
There two lights above each wing near the escape hatches.

 4.  Lighting Controls for the Emergency Lights__________________________________________
 A.  The emergency lights will come on when there is an electrical power failure, only if the emergency lights switches are in the correct position.
 B.  The primary control for the emergency lights is a switch on the pilot's overhead panel, P5.
 (1)  
There is a NOT ARMED indicator light adjacent to this switch.

 (2)  
When this switch is set to ON, all the emergency lights come on. In the OFF position, the emergency lights stay off unless the attendant's emergency lights switch is set to ON.

 (a)  
The NOT ARMED indicator light comes on in these switch positions.

 (b)  
The MASTER CAUTION and OVERHEAD indicator lights on the lightshield, P7, also come on.

 (3)  
In the ARMED position, all the emergency lights will come on automatically in an electrical power failure. The emergency lights will come on manually if the attendant's emergency lights switch is set to ON.

 (a)  
The pilot's switch is usually set to the ARMED position.

 (b)  
There is a cover on the switch to keep it in the ARMED position. The cover prevents an accidental movement of the switch to ON or OFF.

 C.  The secondary control of the emergency lights is a switch on the aft attendant's panel, P14.
 (1)  
If you set this switch to ON, all the emergency lights will come on.

 (2)  
While the attendant's switch is set to ON, you cannot make the emergency lights go off with the pilot's switch. You must first set the attendant's switch to back to NORM.

 (3)  
This switch has a cover to prevent an accidental movement of the switch to ON.
　
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