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* Ground seeking
* Power seeking.
The ground seeking light has power and the ground is
connected by the action of the system the light monitors.
The power seeking light has ground and the power is connected
by the action of the system the light monitors.
The indicating lights (red, amber, blue, and green) are press-totest.
The lights can be bright or dim by the master dim and test
(MD&T) switch on the P1-3 panel.
When the MD&T switch is in the bright (BRT) position, relays
R33 and R34 are deenergized. Power for the ground seeking
lights and ground for the power seeking lights goes through
relay R33. When the MD&T switch is in the DIM position, relay
R34 energizes and power and ground goes through the zener
diodes.
In the TEST position, relay R33 energizes. This supplies power
and ground to make all of the indicating lights come on bright.
Training Information Point
The fire warning system has its own test switch on the P8 panel.
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Purpose
The lights in the passenger compartment supply these
functions:
* General light in the passenger cabin
* Reading lights
* Information lights for the passengers and attendants
* Lights in the lavatories
* Lights in the galleys.
The light system also lets the passenger call the attendants for
aid.
The passenger compartment lights has these subsystems:
* Window lights
* Ceiling lights
* Reading lights
* Passenger signs
* Lavatory lights and signs
* Passenger and lavatory call lights
* Attendant work lights
* Galley lights
* Entry lights.
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Purpose
You control these passenger cabin lights from the forward and
aft attendant panels:
* Ceiling
* Window
* Entry
* Work
* Emergency (aft panel only).
Location
The P13 forward attendant panel is on the forward lavatory wall.
The P14 aft attendant panel is on the aft lavatory wall.
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Purpose
The window lights supply lighting to the areas below the
stowage bins in the passenger compartment.
Physical Description
The window lights use fluorescent lamps. The ballast assembly
is in the lamp support assembly. The ballast assembly supplies
power to the fluorescent lamps in its own lamp assembly and to
the adjacent lamp assembly.
The window lights have these components:
* Ballast assembly (on every other lamp support)
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