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SECTION
3
EMERGENCY
PROCEDURES
CESSNA
MODEL
172N
RPM
taxi. Under
these
conditions,
the
light
will
go
out
at
higher
RPM.
The
master switch
need
not
be
recycled
since
an over-voltage condition
has
not
occurred to
de-activate
the alternator
sYstem.
If
the over-voltage sensor should shut down the alternator, or
if
the
alternator circuit breaker
should
trip,
a
discharge
rate
will
be
shown
on
the
ammeter
followed
by
illumination
of
the
low-voltage warning light.
Since
this
may
be a
"nuisance" trip-out,
an
attempt
should
be
made to
reactivate
the
alternator
system.
To
do
this, turn
the
avionics
power
switch
off,
check
that
the
alternator circuit breaker is in,
then
turn both
sides of the
master
switch off
and
then on again.
If
the problem no longer exists, normal
alternator charging
will
resume
and
the
low-voltage Iight
wiII
go
off.
The
avionics
power
switch
may then
be
turned
back
on.
If
the
light 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.
If
the emergency occurs
at
night,
power must
be
conserved for
later
use of
the
landing lights
and
flaps during landing.
3- 18
1
July
1979
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