Textron Cessna 172R - Ammeter Shows Excessive Rate of Charge (Full Scale Deflection); Electrical Power Supply System Malfunctions; Low Voltage Annunciator (VOLTS) Illuminates During Flight (Ammeter Indicates Discharge)

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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