Textron Cessna 172R, Pilot Operating Handbook

Page: 95 / 500

CESSNA
MODEL 172R
SECTION 3
EMERGENCY PROCEDURES
INSUFFICIENT RATE OF CHARGE
NOTE
The low voltage annunciator (VOLTS) may come on and
I
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
■
annuciator will go off at higher RPM.
I
If the overvoltage sensor should shut down the alternator
and trip
the alternator circuit breaker (ALT FLD), 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
thisl
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 (ALT FLD) is in, then
set
both sides of the
master switch
tol
the OFF position and then
to the ON position. If the problem
no|
longer exists, normal alternator charging will
resume
and the low
voltage annunciator (VOLTS) will go off. The avionics
master
switch
I
may 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 7
3-23/3-24
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