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CHEROKEE
140
"D"
SECTION
II
Circuit
provisions
are made to handle
a
complete
complement
of
communications
and
navigational
equipment.
The
alternator
system
offers
many
advantages
over
the
generator
system.
The main
advantage
is full
electrical
power
output
at much
lower
engine
RPM
and
results
in improved
radio
and
electrical
equipment
operation.
Since the alternator
output
is
available
all
the
time, the
battery
will
be
charging
almost
continuously.
This will make
cold weather
starting easier.
In
generator
systems,
the ammeter
indicates battery discharge.
In
the Cherokee
electrical
system
the ammeter
displays
in
amperes
the
load placed
on the alternator.
With
all
electrical
equipment
except the
master
switch
in the OFF
position,
the ammeter
will indicate
the
amount
of charging
current
demanded by
the battery.
As each
item
of
electrical
equipment
is
turned
on, the current
will
increase
to a total
appearing
on
the
ammeter.
This
total
includes
the
battery.
The
maximum
continuous
load for
night
flight
with radios on
is
about
30
amperes.
This 30 ampere value
plus
approximately
2 amperes
for
a
fully
charged
battery
will appear
continuously
under
these
flight
conditions.
The master
switch
is
a
split switch with the
left
half operating
the
master
relay and the right
half
energizing
the alternator.
The switch
is
interlocked
so
that
the
alternator
cannot
be
operated
without
the
battery.
For
normal
operation,
be
sure
both halves
are turned
on.
If
no
output
is indicated
on the ammeter,
during flight,
reduce the
electrical
load by
turning
off all unnecessary
electrical
equipment.
Check
both
the
5
ampere
field breaker
and
60
ampere
output
breaker
and reset
if
open. If neither
circuit
breaker is
open, turn off the "ALT"
switch
for
30
seconds
to reset
the overvoltage
relay.
If ammeter
continues
to
indicate
no output,
turn
off the "ALT"
switch,
maintain
minimum
electrical
load
and terminate
flight
as soon
as
practical.
Maintenance
on the alternator
should
prove
to
be
a minor
factor.
Should
service
be
required,
contact
the
local
Piper Dealer. Do not take
off with
a
fully discharged battery
as
3
volts are
needed
to
excite
the
alternator.
HEATING
AND VENTILATING
SYSTEM
Heat
for
the
cabin
interior
and the
defroster
system
is provided by
700801
9
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