SECTION 7
AIRPLANE & SYSTEMS DESCRIPTION
CESSNA
MODEL 172R (180 HP)
I
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
I
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
Ito either the DIM or BAT position.
The annunciator panel can be tested by turning the Master
Switch On and holding the annunciator panel switch in the TST
position. All amber and red messages will flash until the switch is
released.
I
NOTE
When the Master Switch is turned ON, some annunciators
will flash for approximately 1 O seconds before illuminating
steadily. When the annunciator panel switch is toggled up
and held in the TST position, all remaining annunciators
will flash until the switch is released.
7-32
Oct 4/01
Summary of Contents for 172R180HP
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