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color means:
* Red - warning
* Amber - caution
* Blue - position
* Green - power on
* White - information.
Training Information Point
There are two types of lamps that you can install in the indicator
lights. If you use the wrong lamp, damage to the lens cover can
occur. Make sure the replacement lamp has the same part
number as the one you remove.
NOTE: Use the Wiring Diagram Manual to find the correct
system circuit breakers for each light indicator.
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LIGHTS - INSTRUMENT AND PANEL LIGHTS - INDICATOR LIGHTS
LIGHTS - INSTRUMENT AND PANEL LIGHTS - INDICATOR LIGHTS
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Purpose
The lighted push-button switches supply control inputs to their
systems. They can also supply information on system condition.
Location
Many airplane systems have lighted push-button switches in
the flight compartment. Lighted push-button switches are on
these panels:
* Instrument panels
* Overhead panels
* Electronics (aisle stand) panels.
Physical Description
The lighted push-button switches use incandescent lamps to
give light. Each lighted push-button switch has these
components:
* Lens cap
* Master module
* Diode/fuse card
* Housing
* Sleeve.
FUNCTIONAL DESCRIPTION
Each push-button switch contains four independent switch
circuits. Each switch circuit contains these type of components:
* Normally open contact
* Normally closed contact
* Common wiper.
The two types of lighted push-button switches are momentary
and alternate. The momentary switch changes condition when
you push the cap assembly. It changes back to its original
condition when you remove the pressure. The alternate switch
changes condition when you push the cap assembly. It stays in
that condition until you push it again. The master module in the
switch body sets the type of switch.
The power to operate the lighted push-button switches may
come from different sources. Use the Wiring Diagram Manual to
find the correct source of power.
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LIGHTS - INSTRUMENT AND PANEL LIGHTS - LIGHTED PUSH-BUTTON SWITCHES
LIGHTS - INSTRUMENT AND PANEL LIGHTS - LIGHTED PUSH-BUTTON SWITCHES
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The system status information is on the flight compartment
panels. The master warning and caution lights provide a central
location for information for the crew about alarms and faults for
various systems.
Location
The master warning and caution lights are on the P7 glareshield
panel.
General Description
The two MASTER CAUTION lights are amber. They both come
on whenever one of the annunciator lights comes on. The lights
are push-to-reset. This makes the MASTER CAUTION and
annunciator light go out.
The annunciators are two amber blocks of six lights each. Each
light shows the system that has the fault. Push either
annunciator for a test of all annunciators and the MASTER
CAUTION lights.
If a fault is detected, the particular annunciator and the two
MASTER CAUTION lights come on. The lights go out by a push
of either of the MASTER CAUTION lights.
Push either annunciator block to recall the light for the system
that has the fault.
See the chapters and sections in AMM PART I for each
annunciator function.
Training Information Point
Do not leave the MASTER CAUTION lights on when they are not
necessary. Excessive heat can distort the lenses.
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