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service light.
Nose Landing Gear Service Light
Figure 16-15
LIGHTING
16-20 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Main Avionics Compartment
The main avionics compartment service light is installed on the right side of the
avionics bay. There is one toggle switch to operate the service light. The switch is
identified as SERVICE LIGHT and is typically installed above the compartment
service light, depending on completion.
Aft Equipment Compartment
There are three service lights installed in the aft equipment compartment. One toggle
switch operates the three lights. The switch is identified as SERVICE LIGHT and is
installed on the left side of the compartment, above the access door frame.
Service Lights - Location and Controls
Figure 16-16
Typical
AFT EQUIPMENT COMPARTMENT
SERVICE LIGHT
SERVICE LIGHT TOGGLE SWITCH
(IN AFT EQUIPMENT COMPARTMENT)
Service Light
Toggle Switch
NLG WHEEL WELL SERVICE LIGHT
AND TOGGLE SWITCH
Service Light
Toggle Switch
MAIN AVIONICS COMPARTMENT
SERVICE LIGHT AND TOGGLE SWITCH
P604_16_023
LIGHTING
For Training Purposes Only
May 03
16-21
P I LOT T R A I N I N G GU I D E
Emergency Lighting
Description
The emergency lighting system provides illumination to the main cabin door and the
right-hand overwing exit, as well as to the cabin interior, and floor level lighting
leading to the aircraft exits.
Components and Operation
Power Supply
The emergency lights are powered by two self-contained, rechargeable battery packs
that receive a “trickle” charge from the DC essential bus. When in use, each pack
provides approximately fifteen minutes of power to the emergency lighting system.
When the battery packs’ power supply is low, a caution message EMER LTS OFF will
appear on the EICAS.
Interior Emergency Lights
The location and the number of the interior emergency lights varies depending on the
aircraft’s completion. If installed, the aircraft will have white floor track lighting that
leads to red lighting. The red lighting is typically used to mark the location of the
aircraft’s two emergency exits.
Exterior Emergency Lights
There are four exterior emergency lights and their locations are as follows:
• one light located forward of the cabin door
• two lights forward and one light aft of the overwing exit
LIGHTING
16-22 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Exterior Emergency Lights
Figure 16-17
PASS SIGNS EMER LTS
NO SMKG SEAT BELTS
ON
OFF
ARM
FDR
EVENT
ON
OFF
AUTO
ON
OFF
AUTO
O
A A
PASSENGER SIGNS / EMERGENCY LIGHTS PANEL
P604_16_026
EMER LTS Switch
ON
OFF
– Emergency lights illuminate
– Emergency lights are turned off
ARM – Emergency lights illuminate if electrical power is lost
LIGHTING
For Training Purposes Only
May 03
16-23
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The EMER LTS switch located on the PASS SIGNS / EMER LTS panel controls the
emergency lights. The EMER LTS switch has three positions: ON, OFF, and ARM.
When selected to ON, the emergency lights illuminate and are powered by their
respective battery packs. The battery packs do not continue to “trickle” charge and the
EMER LTS ON status EICAS message will appear.
When selected to OFF, power is removed from the emergency lighting system. If the
DC essential bus is powered, and the emergency lights are selected OFF, the battery
packs continue to “trickle” charge and the EMER LTS OFF caution EICAS message
will appear.
When selected to ARM, the preset conditions for automatic illumination is a power
loss on the AC essential bus or DC essential bus.
When these conditions are met, the emergency lighting system will illuminate and the
EMER LTS ON status EICAS message will appear.
When selected to ARM, the battery packs will “trickle” charge as long as the preset
conditions for illumination are not met.
During aircraft shutdown, if AC power is removed with the EMER
LTS switch in the ARM position, the emergency lighting system
will activate and can only be reset (turned off) by restoring AC
power, then moving the switch to the OFF position.
EICAS Messages
NOTE
MESSAGE MEANING
EMER LTS OFF Emergency lights have been turned OFF, or power supply is below 4.7 VDC.
EMER LTS ON Emergency lights have been activated and battery is above 4.5 VDC.
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