CESSNA SECTION 7
MODEL 182T AIRPLANE & SYSTEMS DESCRIPTION
ELECTRICAL SYSTEM
The airplane is equipped with a 28-volt, direct current electrical
system (Refer to Figure 7-7). The system is powered by a belt-
driven, 60-amp alternator and a 24-volt battery, located in the tail of
the airplane. Power is supplied to most general electrical circuits
through a split primary bus, with an essential bus wired between the
two primaries to provide power for the master switch, annunciator
circuits and interior lighting.
Each primary bus bar is also connected to an avionics bus bar
via a single avionics master switch. The primary buses are on
anytime the master switch is turned on, and are not affected by
starter or external power usage. The avionics buses are on when
the master switch and avionics master switch are in the ON
position.
PRIOR TO TURNING THE MASTER SWITCH ON
OR OFF, STARTING THE ENGINE OR APPLYING
AN EXTERNAL POWER SOURCE, THE AVIONICS
MASTER SWITCH, LABELED AVIONICS MASTER,
SHOULD BE TURNED OFF THE PREVENT ANY
HARMFUL TRANSIENT VOLTAGE FROM
DAMAGING THE AVIONICS EQUIPMENT.
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
above the avionics stack 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.
Apr 30/01 7-33
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