Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
LOW
VOLTAGE
ANNUNCIATION
The low
voltage
warning
annunciator is
incorporated
in
the
I
annunciator
panel
and activates
when
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
opens
the
ALT
FLD
circuit
breaker,!
removing
alternator
field
current
and
shutting
off
the alternator.
The
I
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
normal. The
alternator
control unit
may
be
reset
by
resetting
the
circuit breaker.
If
the low
voltage 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
practical.
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
light
will
go
out at
higher
RPM.
CIRCUIT
BREAKERS
AND
FUSES
All
circuit breakers inside
the
airplane
are
of
the
"push
to
reset"
or
“switch/breaker”
type.
The
power
distribution module
(J-Box)
uses
either
"push
to
reset"
circuit breakers
or
spade
type
(automotive
style)
fuses.
One
glass
type
fuse
is also used
to
provide
power
to
the clock.
On aircraft
using
spade
type
fuses
in
the
power
distribution
module
(J-Box),
a
spare
fuse
is
also
included.
If
the
spare
fuse
is
used,
a
replacement
spare
should be obtained
and
reinstalled
before
the
next
flight.
Revision
7
7-35
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English