SECTION
III CHEROKEE
180
5.
Before
starting
the engine, check that
all
radio switches,
light
switches,
and the pitot heat
switch are
in the
off position so as
not
to
create
an overloaded condition
when the
starter is
engaged.
6.
The overvoltage relay is
provided
to protect the electronics
equipment
from
a
momentary
overvoltage condition
(approximately
16.5
volts and up), or a catastrophic
regulator failure. In the event of
a
momentary condition,
the
relay will open
and
the
ammeter will
indicate "0" output
from
the
alternator. The
relay may
be reset
by
switching
the
"ALT"
switch
to
"OFF"
for
approximately
30 seconds
and
then
returning
the "ALT"
switch
to "ON."
7.
The
vacuum
gauge is provided
to monitor the
pressure
available to assure the
correct
operating speed
of the vacuum driven
gyroscopic flight instruments, it also
monitors the
condition of the
common air filter
by measuring
the
flow
of
air thru
the filter.
If
the
vacuum
gauge registers lower
than
5"
±
.10" Hg
at 2000
RPM,
the
following
items should be checked before
flight:
a. Common air filter, could be
dirty
or restricted.
b. Vacuum
lines could be
collapsed
or broken.
c. Vacuum
pump, worn.
d. Vacuum
regulator, not
adjusted correctly. The
pressure,
even
though
set correctly,
can read lower
under two
conditions: (1)
Very
high
altitude, above
12000
feet, (2)
Low
engine RPM usually on
approach or
during training
maneuvers.
This is
normal and should not
be considered a malfunction.
PIPER
AUTOMATIC
LOCATOR
The Piper Automatic Locator,
when
installed, is
located in the aft
portion
of
the fuselage
just below the
stabilator leading
edge and is
accessible through a
plate on the right side of the fuselage. It is
an
emergency
locator
transmitter
which meets the
requirements of FAR
91.52. It is
automatically
activated by
a longitudinal
force
of
5
to 7
g's
and
transmits a distress
signal
on
both
121.5
MHz
and
243.0
MHz for a
period of
48 hours in low
temperature
areas to 100
hours in high
temperature areas. The unit operates on
a
self contained
battery.
The
battery has a useful
life of four
years. However, to
comply
with FAA regulations,
it must
be
replaced after two years
of shelf life
or
service life.
The
battery
should also be replaced if the
transmitter
has
been used
in an
emergency situation
or if the accumulated
test time
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