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supplied by the 28 VDC ESSential BUS, via the
EPSUs, or by the EPSUs integrated batteries
for at least 12 minutes, if the 28 VDC ESSential
BUS is lost.
- ON position: The Emergency Lighting System is
switched on and supplied by the 28 VDC ESSential
BUS, through the EPSUs, or by the EPSUs
integrated batteries, if the 28 VDC ESSential
BUS is lost.
FROM THE CABIN:
The EMER LIGHT pushbutton located on the FAP allows
the Emergency Lighting System to be switched on.
The EMER LIGHT pushbutton has the same function as the
ON position of the EMER EXIT LT selector on panel 25VU.
TMULIG502-T03 LEVEL 1
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MECHANICS / ELECTRICS & AVIONICS COURSE 33 LIGHTS
UF94200
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ALL
EMERGENCY LIGHTING - SYSTEM PRESENTATION
TMULIG502-P03 LEVEL 1
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ALL
SELF EXAMINATION
When is the Emergency Lighting system supplied by
the EPSUs integrated batteries?
A - When the EMER EXIT LT selector is in the
ON position.
B - When the EMER LIGHT pushbutton on the
FAP is pressed and the 28 VDC ESS BUS is
lost.
C - When the Main Lighting System has failed.
TMULIG502 LEVEL 1
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ALL
33 - LIGHTS
33-51-00 EMERGENCY LIGHTS - CONTROLS
PRESENTATION
CONTENTS:
General
Cockpit Emer Exit Lt Switch
Cockpit No Smoking Switch
Cabin Forward Attendant panel
TMULIGH02 LEVEL 1
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EMERGENCY LIGHTS - CONTROLS PRESENTATION
GENERAL
The emergency lighting system can be controlled from
the cockpit or from the cabin.
COCKPIT EMER EXIT LT SWITCH
The EMER EXIT LT switch located in the cockpit controls
all the emergency lighting system.
This switch has three positions:
In OFF position, without AC and DC busbar voltage, a
ground signal prevents the emergency lighting system
from switching on.
In OFF position, with the DC essential busbar
energized, the EMER EXIT LT OFF annunciator comes on
amber.
In ARM position, all the emergency lighting system
comes on if the 115 VAC busbar fails.
The emergency lighting system is supplied by the 28VDC
essential busbar.
In case of failure of the 28VDC essential busbar,
batteries in each EPSU continue to supply the emergency
lighting system for at least 12 minutes.
In ON position, all the emergency lighting system comes
on.
When the doors are open with the slides armed, the
lights integrated in the escape slide come on.
When the emergency exit doors are open with the slides
armed, the lights on the escape routes over the wings
come on.
COCKPIT NO SMOKING SWITCH
The NO SMOKING switch located in the cockpit controls
the EXIT signs and the emergency escape hatch handle
lights.
This switch has three positions:
In OFF position, the EXIT signs and the emergency
escape hatch handle lights go off.
In AUTO position, the EXIT signs and the emergency
escape hatch handle lights only come on when the
landing gear is extented.
With the landing gear retracted the lights remain off.
In ON position, the EXIT signs and the emergency escape
hatch handle lights come on.
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ALL
EMERGENCY LIGHTS - CONTROLS PRESENTATION -
TMULIGH02-P01 LEVEL 1
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ALL
EMERGENCY LIGHTS - CONTROLS PRESENTATION
CABIN FORWARD ATTENDANT PANEL
The LIGHT EMER pushbutton on the Forward Attendant
Panel (FAP) controls all the emergency lighting system
whatever the position of the EMER EXIT LT in the
cockpit.
When the LIGHT EMER pushbutton is pressed all the
emergency lighting system comes on.
In case of an excessive cabin depressurization, the
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