Piper Automatic Locator - Piper CHEROKEE 180 Owner's Handbook Manual

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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