Cessna 182T 2001, Pilot Operating Handbook

Page: 212 / 254

SECTION 7 CESSNA
AIRPLANE & SYSTEMS DESCRIPTION MODEL 182T
AMMETER
The vacuum gauge/ammeter is located on the lower left side of
the instrument panel. It indicates the amount of current, in amperes,
from the alternator to the battery or from the battery to the airplane
electrical system. When the engine is operating and the master
switch is turned on, the ammeter indicates the charging rate applied
to the battery. In the event the alternator is not functioning or the
electrical load exceeds the output of the alternator, the ammeter
indicates the battery discharge rate.
LOW VOLTAGE ANNUNCIATION
The low voltage warning annunciator is incorporated in the
annunciator panel and activates anytime voltage falls below 24.5
volts. If low voltage is detected, the red annunciation VOLTS will
flash for approximately 10 seconds before illuminating steadily. The
pilot cannot turn off the annunciator.
In the event an overvoltage condition occurs, the alternator
control unit automatically pops the ALT FLD circuit breaker,
removing alternator field current and shutting down the alternator.
The battery will then supply system current as shown by a
discharge rate on the ammeter. Under these conditions, depending
on electrical system load, the low voltage warning annunciator will
illuminate when system voltage drops below 24.5 volts. The
alternator control unit may be reset by resetting the circuit breaker.
If the warning annunciator extinguishes, normal alternator charging
has resumed; however, if the annunciator illuminates again, a
malfunction has occurred, and the flight should be terminated as
soon as practicable.
NOTE
Illumination of the low voltage annunciator and ammeter
discharge indications may occur during low RPM conditions
with an electrical load on the system, such as during a low
RPM taxi. Under these conditions, the annunciator will go
out at higher RPM.
7-38 Apr 30/01