CESSNA
MODEL
172R
SECTION
3
EMERGENCY
PROCEDURES
ELECTRICAL POWER
SUPPLY SYSTEM
MALFUNCTIONS
AMMETER SHOWS EXCESSIVE RATE
OF
CHARGE
(Full
Scale
Deflection)
1
.
Alternator
--
OFF.
A
CAUTION
WITH THE
ALTERNATOR SIDE OF THE MASTER
SWITCH
OFF, COMPASS DEVIATIONS OF
AS
MUCH AS
25°
MAY
OCCUR.
2.
Nonessential Electrical Equipment
--
OFF.
3. Flight
--
TERMINATE as
soon as
practical.
LOW VOLTAGE ANNUNCIATOR (VOLTS) ILLUMINATES DURING
FLIGHT
(Ammeter
Indicates Discharge)
|
NOTE
Illumination
of "VOLTS"
on the
annunciator panel 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.
The
master
switch need
not
be
recycled
since
an
overvoltage
condition has
not
occurred
to
deactivate
the
alternator
system.
r1
.
Avionics
Master Switch
-
OFF.
■
2.
Alternator
Circuit Breaker (ALT FLD)
--
CHECK IN.
■
3.
Master
Switch
--
OFF
(both sides).
4.
Master
Switch
--
ON.
5.
Low
Voltage
Annunciator
(VOLTS)
--
CHECK OFF.
I
6.
Avionics Master
Switch
--
ON.
If
low
voltage
annunciator (VOLTS)
illuminates
again:
I
7.
Alternator--
OFF.
8.
Nonessential
Radio and
Electrical
Equipment
-
OFF.
9.
Flight
-
TERMINATE as
soon as
practical.
Revision
7
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