Textron Cessna 172R - Page 116

SECTION
4
NORMAL
PROCEDURES
CESSNA
MODEL
172R
I
I
b. Taxi
and
Landing Light
Switches
--
ON
(to
provide
an
initial electrical load
on
the
system).
c.
Engine
RPM
--
REDUCE
to
idle.
(Minimum
alternator
output
occurs
at
idle.)
d. Master
Switch
--
ON
(with
taxi and
landing
lights
switched
on).
(The
ammeter
should indicate
in
the
negative
direction,
showing
that the alternator
output
is
below the load
requirements,
but the
battery
is
supplying
current to
the
system.)
e.
Engine
RPM
--
INCREASE
to
approximately
1
500
RPM
(as
engine
RPM
increases,
alternator
output
should
increase
to meet
the
system
load
requirements).
f.
Ammeter and
Low
Voltage
Annunciator
--
CHECK
(the
ammeter
should
indicate
in
the
positive
direction,
showing
that the alternator
is
supplying
current
and the
1
Low
Voltage
Annunciator
(VOLTS)
should
not
be
lighted).
NOTE
If
the
indications,
as
noted
in
Step
"d" and
Step
"f",
are
not
observed,
the
electrical
system
is
not
functioning
properly.
Corrective
maintenance
must
be
performed
to
provide
for
proper
electrical
system
operation
before
flight.
1
6.
Navigation Lights
--
ON
as
required.
17.
Avionics Master
Switch
--
ON.
18.
Radios
--
ON.
19.
Flaps
-
RETRACT.
4-14
Revision
8
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