Textron Cessna 172R - Annunciator Panel

SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
CESSNA
MODEL
172R
The
airplane
uses
a
power
distribution
module
(J-Box),
located
on
the
left
forward
side
of
the
firewall,
to
house all
relays
used
throughout
the
airplane
electrical
system.
In
addition,
the alternator
control unit
and
the
external
power
connector
are
housed within the
module.
ANNUNCIATOR
PANEL
An
annunciator
panel
(with
integral
toggle
switch)
is located
on
the
left
side
of
the instrument
panel
and
provides
caution
(amber)
and
warning
(red)
messages
for
selected
portions
of
the
airplane
systems.
The
annunciator
is
designed
to
flash
messages
for
approximately
10
seconds
to
gain
the attention
of
the
pilot
before
changing
to
steady
on.
The annunciator
panel
cannot
be turned
off
by
the
pilot.
Inputs
to
the
annunciator
come
from
each
fuel
transmitter,
the
low oil
pressure
switch,
the
vacuum
transducers and the
alternator
control
unit
(ACU).
Individual
LED
bulbs illuminate each
message
and
may
be
replaced
through
the
rear
of
the annunciator.
Illumination
intensity
can
be controlled
by placing
the
toggle
switch
in
either the
DIM
or
BRT
positions
(earlier
serial number
airplanes)
or
the
DAY
or
NIGHT
positions
(later
serial number
airplanes).
The
annunciator
panel
can
be
tested
by placing
the
Master
switch
in
the
ON
position
and
holding
the
annunciator
panel
test
switch
in
the
TST
(earlier
serial number
airplanes)
or
the
TEST
(later
serial number
airplanes)
position.
All
amber and red
messages
will
flash
until the switch is released.
NOTE
When the
Master switch
is turned
ON,
some
annunciators
will
flash for
approximately
10
seconds
before
illuminating
I
steadily.
When the annunciator
panel
test
switch is held
in
the
TST
(earlier
serial
number
airplanes)
or
the
TEST
(later
serial number
airplanes)
position,
all
remaining lights
will
flash
until the switch is released.
7-32
Revision
8
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