Piper Lance II User Manual

LANCE
II
SERVICE
MANUAL
11-29.
ALTERNATOR
SYSTEM
(PRESTOLITE).
11-30.
CHECKING
ALTERNATOR
SYSTEM.
With
all
electrical
equipment
off
(except
master
switch)
the
ammeter
will
indicate
the
amount
of
charging
current
demanded
by
the
battery.
This
amount
will
vary,
depending
on
the
percentage
of
charge
in the
battery
at
the
time.
As
the
battery
becomes
charged,
the
amount
of
current
displayed
on
the
ammeter
will
reduce
to approximately
two
amperes.
The
amount
of current
shown
on
the
ammeter
will
tell
immediately
whether
or
not
the
alternator
system
is operating
normally,
if the
following
principles
are
kept
in mind.
NOTE
The
amount
of
current
shown
on
the
ammeter
is the
load
in
amperes
that
is
demanded
by
the
electrical
system
from
the
alternator.
As
a check,
take
for
example
a condition
where
the
battery
is
demanding
10
amperes
charging
current,
then
switch
on
the
landing
light.
Note
the
value
in
amperes
placarded
on
the
circuit
breaker
panel
for
the
landing
light
circuit
breaker
(10
amps)
and
multiply
this
by 80
percent,
you
will
arrive
at
a
current
of
8
amperes.
This
is
the
approximate
current
drawn
by
the
light.
Therefore,
when
the
light
is switched
on,
there
will
be
an
increase
of
current
from
10
to
18
amperes
displayed
on
the
ammeter.
As
each
unit
of
electrical
equipment
is
switched
on,
the
current
will
add
up
and
the
total,
including
the
battery,
will
appear
on
the
ammeter.
Using
the
example
that
the
airplane's
maximum
continuous
load
with
all
equipment
on
is
approximately
48
amperes
for
the
60
ampere
alternator.
This
approximate
48
ampere
value,
plus
approximately
two
amperes
for
a
fully
charged
battery,
will
appear
continuously
under
these
flight
conditions.
If
the
ammeter
reading
were
to
go
much
below
this
value,
under
the
aforementioned
conditions,
trouble
with
the
alternator
system
would
be
indicated
and
corrective
action
should
be
taken
by
switching
off
the
least
essential
equipment.
The
following
test
procedure
could
be
helpful
in
locating
faulty
components:
a.
Ascertain
that
the
airplane
is
positioned
so that
the
prop
blast
will
not
interfere
with
other
operations
going
on
near
by.
Start
engine
and
set
throttle
for
1000
to
1200
RPM.
b.
Switch
on
the
following
loads
and
observe
the
ammeter
output
increase
as
indicated.
1.
Navigation
and
instrument
lights
(bright
position)
- approx.
9
amps.
2.
Landing
light
- 7
to
9
amps.
If
alternator
does
not
meet
above
indications,
refer
to
troubleshooting
chart.
Follow
troubleshooting
procedure
outlined
on
the
chart
in
a
step
by
step
fashion
checking
each
cause
and
isolation
procedure
under
a given
trouble
before
proceeding
to
the
next.
On
airplanes
without
night-flying
equipment,
load
required
by
test
can
be
simulated
by
connecting
a lamp-bank
load
consisting
of
8
landing
lights
wired
in
parallel
from
main
bus
(+)
to
airframe
ground
(-)
(Refer
to
Figure
1 1-1)or
3 ohm,
100
watt
resistors.
Issued:
1/3/78
ELECTRICAL
SYSTEM
2G11

Piper Lance II Specifications

General

Manufacturer	Piper Aircraft
Max Takeoff Weight	3, 600 lb (1, 633 kg)
Crew	1
Horsepower	300 hp
Seats	6
Length	27 ft 7 in (8.41 m)
Capacity	5 passengers