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EXIT signs and the emergency escape hatch handle lights
automatically come on.
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EMERGENCY LIGHTS - CONTROLS PRESENTATION - CABIN FORWARD ATTENDANT PANEL
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33 - LIGHTS
33-50-00 EMERGENCY LIGHTS - SYSTEM D/O -
BASIC SEAT MOUNTED "AIRSIGNAL"
EEPMS
CONTENTS :
General
Electrical Supply
Emergency Power Supply Units
Operation
Test
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EMERGENCY LIGHTS - SYSTEM D/O - BASIC SEAT MOUNTED "AIRSIGNAL" EEPMS
GENERAL
The emergency lighting system provides illumination
in case of failure of the main lighting system or
during emergency conditions.
The Emergency Power Supply Units (EPSUs) supply all
these different lights.
The emergency lights are equipped with 6VDC lamps.
ELECTRICAL SUPPLY
The Emergency Power Supply Units are supplied with
28VDC from the Essential busbar for operation and
115VAC from the Normal AC busbar voltage sensing.
EMERGENCY POWER SUPPLY UNITS
The EPSUs supply the following lights:
- Exit signs lights,
- Cabin emergency lights,
- Floor Proximity Emergency Escape Path Marking
lights,
- Escape slide lights,
- Overwing emergency lights,
- and escape hatch-handle lights.
The EPSUs also monitor the correct voltage of the AC
and DC busbars.
The Emergency Power Supply Units (EPSUs) convert 28VDC
into 6 VDC to operate their associated lights. An
internal 6VDC battery in each EPSU is charged
continuously when the Essential busbar is energized.
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EMERGENCY LIGHTS - SYSTEM D/O - BASIC SEAT MOUNTED "AIRSIGNAL" EEPMS
OPERATION
The EMER EXIT LT switch on the overhead panel controls
the Emergency Lighting System.
The EMER EXIT LT switch has three positions : OFF, ARM
and ON. Each of these positions sends a discrete ground
signal to the Emergency Power Supply Units.
OFF
In the OFF position a ground signal prevents the
Emergency Lighting System from being switched on when
the AC and DC busbar voltages are not available.The
EMER EXIT LT OFF annunciator light comes on.
Note : The EXIT SIGNS and the emergency escape
hatch-handle lights come on with EMER EXIT LT
switch OFF, when the NO SMOKING switch is in
ON position or in AUTO position with landing
gear extended.
ARM
In the ARM position the EMER EXIT LT OFF annunciator
light goes off.
When the 115VAC busbar voltage is not avalaible, the
cabin Emergency Lighting and the Floor Proximity
Emergency Escape Path Marking lights System come on.
The power is supplied from the 28VDC/6VDC converter
in the corresponding EPSU.
When the 28VDC busbar voltage is not available, the
batteries of all EPSUs supply the Emergency Lighting
System for at least 12 minutes.
The batteries are no longer charged.
ON
In the ON position the Emergency Lighting System comes
on, as if the LIGHT EMER pushbutton on the Forward
Attendant Panel was pushed.
The cabin emergency lights, the exit signs, the escape
hatch-handle lights and the floor proximity lights
come on. The 28VDC/6VDC converters of the EPSUs supply
these loads as long as the 28VDC Essential busbar is
available.
If the 28VDC busbar voltage falls below 16V, the EPSUs
internal batteries continue to supply the loads for
　
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