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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.
EICAS Messages
Table 16-1
16-24 For Training Purposes Only
May 03
LIGHTING P I LOT T R A I N I N G GU I D E
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