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the EPSUs, or by integrated batteries when the 28 VDC
ESSential BUS is lost.
NOTE: Depending on the Emergency Lighting System
chosen by the airline, additional Power Supply
Units supply FPEEPM lights and exit signs.
CABIN EMERGENCY LIGHTS
Cabin Emergency Lights are installed throughout the
Cabin, in the main and cross aisle ceiling panels, in
order to provide illumination of the Cabin and Exit
Areas.
EXIT SIGNS
The Emergency Lighting System provides illumination
of the EXIT MARKING signs and EXIT LOCATION signs,
installed at the Aft/FWD Passenger/Crew Doors and at
the Emergency Exit doors.
There are three types:
- WALL-MOUNTED EXIT marking signs, one for each FWD/Aft
Passenger/Crew door and Emergency Exit door,
- EXIT LOCATION sign, double sided, or single sided
for the overwing Emergency Exits,
- EXIT MARKING signs, for each Passenger/Crew door and
one for each Emergency Exit door.
One Escape Hatch-Handle Light is integrated on each
Emergency Exit door (A319/A320).
NOTE: The EXIT signs and associated lights can be
manually switched on from the NO SMOKING switch
located on the overhead panel, or automatically
in case of rapid decompression or with the
SLAT/FLAP and/or LANDING GEAR condition(s).
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EMERGENCY LIGHTING - SYSTEM PRESENTATION
FLOOR PROXIMITY EMERGENCY ESCAPE PATH MARKING SYSTEM
(FPEEPMS).
The Emergency Lighting System provides power supply
of the FLOOR PROXIMITY EMERGENCY ESCAPE PATH MARKING
SYSTEM (FPEEPMS).
The system consists of incandescent or
electroluminescent "EXIT" MARKER lights, installed
immediately adjacent to the Passenger/Crew doors and
Emergency Exit doors, and LIGHT SEAT-MOUNTED or LIGHT
STRIPS ON FLOOR.
This system provides low level illumination of the
Passenger aisles and Escape routes if smoke obscures
the normal Emergency Lighting.
TMULIG502-T02 LEVEL 1
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MECHANICS / ELECTRICS & AVIONICS COURSE 33 LIGHTS
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EMERGENCY LIGHTING - SYSTEM PRESENTATION
TMULIG502-P02 LEVEL 1
EFFECTIVITY 33-50-00 Page 5
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MECHANICS / ELECTRICS & AVIONICS COURSE 33 LIGHTS
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ALL
EMERGENCY LIGHTING - SYSTEM PRESENTATION
LAVATORY AUXILIARY LIGHT
A Lavatory Auxiliary Light is installed in each
Lavatory and is illuminated as long as the 28 VDC ESS
BUS is available.
NOTE: The Lavatory Auxiliary Lights are the only lights
of the Emergency Lighting System not connected
to the EMERGENCY POWER SUPPLY UNITS(EPSUs): As
soon as the 28VDC ESS BUS is lost, the Lavatory
Auxiliary Lights are no longer supplied.
DOOR ESCAPE SLIDE LIGHTS
The Emergency Lighting System provides power supply
for the integral lights installed in the Door Escape
Slides.
The integral lights are switched on when the Slides
are armed and the Doors open.
EMERGENCY POWER SUPPLY UNIT (EPSU)
EMERGENCY POWER SUPPLIED UNITS (EPSUs) located in the
Cabin, allow the associated Emergency Lights to be
electrically supplied by the 28 VDC ESSential BUS, via
the EPSUs, or by the EPSUs integrated batteries, if
the 28 VDC ESSential BUS is lost.
When the 28 VDC ESSential BUS is lost, the integrated
batteries can supply the Emergency Lighting System for
at least 12 minutes.
CONTROLS
The Emergency Lighting System is controlled from the
cockpit by the Flight Crew by a three position switch
"EMER EXIT LT" located on the Overhead panel or from
the cabin by the Cabin Attendants by the "EMER"
pushbutton located on the FAP.
FROM THE COCKPIT:
The EMER EXIT LIGHT(LT) selector allows the Emergency
Lighting System to be manually or automatically
activated.
- OFF position: The Emergency Lighting System is
not supplied and the AMBER OFF light comes on.
- ARM position: If the Main Cabin Lighting System
is lost or during Emergency conditions the
Emergency Lighting System is automatically
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