Piper Lance II User Manual

RHEOSTAT
AMMETER
ROTOR
BATTERY
VOLTMETER
Figure
1 1-27.
Testing
Rotor
for
Ground
Figure
1
1-28.
Testing
Rotor
for
Shorts
other
direction.
If the
test
bulb
lights
in
both
directions,
one
or more
of
the
rectifiers
in that
heat
sink
is
shorted.
To
pinpoint
the
defective
rectifier,
the
stator
leads
must
be
disconnected
and
the
above
test
repeated
on
each
rectifier.
Open
rectifiers
can
only
be
detected,
when
using
the
test
bulb,
by
disconnecting
the
stator
leads.
The
test
bulb
will
fail
to
light
in
either
direction
if
the
rectifier
is
open.
c.
Stator:
The
stator
can
be tested
for
open
or
grounded
windings
with
a 12
volt
test
bulb,
described
in
the
rectifier
section,
or
an
ohmmeter,
in
the
following
manner.
Separate
the
stator
from
the
slip
ring
end
head
just
far
enough
to insert
a
fold
of rags
or
blocks
of
wood.
In
other
words,
insulate
the
stator
from
the
end
head.
To
test
for
grounded
windings,
touch
one
test
bulb
or
ohmmeter
probe
to
the
auxiliary
terminal
or
any
stator
lead,
and
the
other
test
bulb
or
ohmmeter
probe
to
the
stator
frame.
If the
test
bulb
lights,
or
the
ohmmeter
indicates
continuity,
the
stator
is
grounded.
To
test
for
open
windings,
connect
one
test
probe
to
the
auxiliary
terminal
or
the
stator
winding
center
connection
and
touch
each
of
the
three
stator
leads.
The
test
bulb
must
light,
or
the
ohmmeter
must
show
continuity.
Due
to
the
low
resistance
in
the
stator
windings,
shorted
windings
are
almost
impossible
to
locate.
However,
shorted
stator
windings
will
usually
cause
the
alternator
to
"growl"
or
be
noisy
during
operation
and
will
usually
show
some
signs
of overheating.
If all
other
electrical
checks
are
normal
and
alternator
fails
to
supply
its
rated
output,
the
stator
should
be replaced
to determine
whether
or
not
it
is the
faulty
component.
d.
Bearings
and
Seals:
Whenever
the
alternator
is
overhauled,
new
bearings
and
oil
or
grease
seals
are
recommended,
even
though
the
bearings
and
seals
appear
to
be
in good
condition.
A
faulty
seal
can
cause
an
alternator
to
fail
within
a
very
short
period
of
time.
Issued:
1/3/78
ELECTRICAL
SYSTEM
2G16
LANCE
II
SERVICE
MANUAL

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