CESSNA
MODEL
172S
SECTION 3
EMERGENCY PROCEDURES
INSUFFICIENT RATE
OF
CHARGE
NOTE
The
low voltage annunciator (VOLTS)
may
come
on
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.
•
I
If
the
overvoltage sensor should shut down
the
alternator
and
trip
the
alternator circuit breaker (ALT
FLO),
or
if
the
alternator output is!
low,
a discharge
rate
will
be
shown
on
the
ammeter followed by
illumination of the low voltage annunciator
(VOLTS). Since this may!
be
a "nuisance" trip
out,
an
attempt should
be
made
to
reactivate
the
alternator system.
To
reactivate, set
the
avionics master switch
to
the
OFF position, check that the alternator circuit breaker (AL
FLO)
is
in,
then set
both
sides of
the
master switch
to
the OF
position
and
then
to
the
ON
position.
If
the
problem
no
longer exists,
normal
alternator charging will
resume
and
the low voltag
annunciator
(VOLTS) will
go
off.
The avionics master switch
ma
then
be
returned
to
the
ON
position.
If
the
annunciator illuminates again, a malfunction
is
confirmed .•
In
this event, the flight should
be
terminated and/or the current drain
on
the
battery minimized because the battery
can
supply the
electrical system for only a limited period
of
time. Battery power
must
be
conserved for later operation of
the
wing flaps
and,
if the
emergency occurs at night, for possible
use
of the landing lights
during landing.
OTHER EMERGENCIES
WINDSHIELD DAMAGE
If
a bird strike or other incident should damage the windshield
in
flight
to
the point
of
creating
an
opening, a significant loss
in
performance
may
be
expected. This loss
may
be
minimized
in
some
cases
(depending
on
amount
of
damage, altitude, etc.) by opening
the
side
windows while the airplane
is
maneuvered for a landing at
the
nearest airport.
If
airplane performance
or
other adverse
conditions preclude landing
at
an
airport, prepare for
an
"off airport"
landing
in
accordance with the Precautionary Landing With Engine
Power
or
Ditching checklists.
Revision 4
3-23/3-241
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