Piper Lance II - Electrical Instruments; Fuel Quantity Indicator; Troubleshooting

LANCE
II SERVICE
MANUAL
10-62. ELECTRICAL
INSTRUMENTS.
10-63. REMOVAL
AND REPLACEMENT.
Refer to
Paragraph
10-76
of this section.
10-64. FUEL QUANTITY INDICATOR
10-65.
GENERAL.
The
two fuel
quantity
gauges
are
mounted
in
the
cluster
on
the
instrument
panel.
These
instruments
are
calibrated
in fractional
devisions
of
one fourth,
one
half,
three
fourths
and
full.
A
transmitter
unit
is installed
in
each
fuel
cell.
This unit
contains
a resistance
strip
and
a movable
control
arm.
The
position
of
this
arm is
controlled
by
a float
in
the
fuel
cell
and
this
position
is transmitted
electrically
to the
indicator
gauge
to show
the amount
of
fuel
in
the cell.
The
two
transmitters
are
connected
in
series,
the
outboard
sender
must
be isolated
from
airframe
ground.
10-66.
TROUBLESHOOTING.
TABLE
X-XIII.
FUEL
QUANTITY
INDICATORS
Trouble
Cause
Remedy
Fuel gauge
fails
to
indicate.
Broken wiring.
Check
and
repair.
Gauge
not
operating.
Replace.
Blown fuse.
Replace
fuse.
Fuel gauge indicates
empty
when
tanks
are
full.
Incomplete
ground.
Check
ground
connections
at fuel
transmitter
in
wings.
Replace
fuse
Blown
fuse
Fuel gauge indicates
full
with tanks
empty.
Incomplete
ground.
Check
ground
at
instru-
ment.
Float arm
stuck.
Replace
fuel
transmitter.
Fuel
gauge
indicates
incorrectly.
Intermittent
ground.
Check
ground
at trans-
mitter
and
instrument.
Float
arm
sticky.
Replace
fuel
transmitter.
Isued: 1/3/78
INSTRUMENTS
2F4