Annunciator Panel - Cessna 172R Operating Handbook

SECTION 7
AIRPLANE & SYSTEMS DESCRIPTION
The airplane uses a power distribution module
on the left forward side of the firewall,
throughout the airplane electrical
control unit and the external power
module.

ANNUNCIATOR PANEL

annunciator panel
An
the left side of the instrument panel and provides caution (amber)
and warning (red) messages for selected portions of the airplane
The annunciator is designed to flash messages for
systems.
approximately 10 seconds to gain the attention of the pilot before
changing to steady
by the pilot.
Inputs to the annunciator
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
The annunciator panel can be tested by placing the Master
switch in the ON position and holding the annunciator panel
switch in the TST
(later serial number airplanes) position.
messages will flash until the switch is released.
When the Master switch is turned
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
serial number airplanes) position, all remaining lights will
flash until the switch is released.
7-32
system.
(with integral toggle switch)
on. The annunciator panel
come
(later serial number airplanes).
(earlier serial number airplanes) or the TEST
NOTE
house all relays used
to
In addition, the alternator
are housed within the
connector
cannot
from each fuel transmitter, the
All amber and red
some annunciators
ON,
CESSNA
MODEL 172R
located
(J-Box),
is located on
be turned off
test
(later
Revision
8