535  Emergency Lights Component Location 
Feb 15/72  Figure 1 (Sheet 4)  33-51-01 
Page 5 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Interior Battery Powered Lights
A.  Portable Exit Light
(1)  
A portable light assembly is installed over the entry, control cabin, and aft galley doors. The portable light assemblies having integral battery packs may be removed from their mountings and used as a flashlight

(2)  
Each portable light assembly consists of incandescent lamps, a solid-state switching logic, a battery-charging control circuit, nickel-cadmium batteries, and a two-position switch. The lamps receive power from the internal batteries only as controlled by solid-state switching logic. A plastic case houses the portable light assembly. The portable light plugs into a mounting plate which is bolted to the airplane interior. A cover that also functions as an EXIT sign is mounted over the light assembly. The light cover may be released from the light assembly by pulling out on the ends of the light cover, thus allowing the cover to slide over a nylon retaining roller. The light assembly may be removed from the mounting and used as a flashlight after pressing in on a spring-loaded lever latch on each end of the light case and releasing the case from the mounting. The toggle switch on the light assembly can then be used to turn the light on when positioned to ON, or off when positioned to ARM. When the light is installed, the switch on the light assembly must be positioned to ARM. The batteries may be replaced, if faulty, after removing two screws and a cover on the back of the case (See figure 1.)

B  Fixed Exit Lights
(1)  The fixed exit lights mounted on the lowered ceiling end caps function as a lighted exit sign and an emergency area light. A separate battery pack with logic and charging circuits is mounted near each light. Each light assembly is comprised of a housing assembly that mounts to the lowered ceiling structure and a lens assembly. The housing assembly contains five midget incandescent lamps for exit sign illumination and two bayonet type incandescent lamps for area illumination. All seven lamps are connected in parallel. The acrylic cover assembly has a translucent coating on all areas except a small clear portion on bottom which is used for area light emission. The cover can be readily removed for relamping by pressing two press-lock type fasteners on its lower side and rotating the cover upward and outward
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33-51-01 Page 6  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/72 

C.  Lighted Exit Signs
(1)  Lighted exit signs are mounted in a recess over each emergency escape hatch and a pair of lighted exit signs are mounted on the center of the raised ceiling between the escape hatches. Each sign uses five midget incandescent lamps to illuminate the exit legend. The translucent acrylic cover has the exit legend on its front side. The cover is removed for relamping by releasing a single latch on its lower center exterior. A single battery pack is used to provide power and control for two exit sign assemblies. The battery packs are installed above the ceiling-mounted exit signs located approximately midpoint between the escape hatches. The battery packs are identical to the battery packs used for the emergency exit sign/lights installed on the lowered ceiling end caps (Fig. 1).
5.  Self-Illuminating Exit Signs
A.  Self-illuminating (nonelectric) exit signs are installed on each lowered ceiling and on the raised ceiling between the emergency escape hatches. These signs use tritium gas radioactivity to cause phosphorescent material in the signs to glow. The tritium gas is sealed in glass capsules at sea-level atmospheric pressure. The capsules are cushioned by a silicone rubber adhesive and imbedded in the durable plastic rectangle that makes up the sign. Normal handling or slight abuse will not damage sign.
B.  The radioactive tritium gas presents no radiological health hazard when signs are intact. However, if the signs are cracked or broken the radioactive gas may escape, thus presenting a health hazard if the material is inhaled or absorbed into the body. Minor scratches, nicks, etc., on sign do not present any hazard. Disposal of signs is subject to the control of radiation protection personnel who must comply with the governmental regulations.
WARNING:  CRACKED OR BROKEN SIGNS REQUIRE SPECIAL HANDLING TO AVOID ANY POTENTIAL RADIOLOGICAL HEALTH HAZARD CONDITIONS. REFER TO 33-51-41, SELF-ILLUMINATING SIGNS MAINTENANCE PRACTICES FOR HANDLING PROCEDURES.
6.  Exterior Emergency Lights
A.  Escape Slide Lights
(1)  There are four escape slide lights located on the exterior of the airplane as shown in figure
　
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