Piper Cherokee Six - Page 519

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
9-56.
REMOVAL
AND
REPLACEMENT.
Refer
to
Paragraph
9-76
of
this
section.
9-57.
TURN
AND
BANK
INDICATOR.
9-58.
GENERAL.
The
turn
and
bank
indicator
can
be
either
vacuum
driven
or
electric.
The
turn
portion
of
the
indicator
is
a
gyroscope,
while
the
bank
portion
of
the
indicator
is a
ball
sealed
in
a
curved
glass
tube
filled
with
damping
fluid.
There
are
two
styles
of
this
unit,
the
first
is
the
old
style
with
a
vertical
needle
in
the
center
of
the
dial.
This
instrument
reads
only
rate
of
turn,
and
unless
the
aircraft
is
turning,
the
needle
will
not
move
regardless
of
bank
angle.
The
other
style
is
the
turn
coordinator
which
will
also
indicate
rate
of
turn
but
due
to
its
construction
will
read
rate
of
roll
also,
which
means
if
the
aircraft
is
rolled
right
and
left
rapidly,
the
indicator
will
move,
indicating
a
turn,
but
if
the
aircraft
is
held
in
a
bank,
by
applying
rudder,
the
indicator
will
come
back
to
zero
indicating
no
turn.
9-59.
TROUBLESHOOTING.
TABLE
IX-XII.
TURN
AND
BANK
INDICATOR
Trouble
Cause
Remedy
Pointer
fails
to
respond.
Incorrect
sensitivity.
Incorrect
turn
rate
(vacuum
style).
Foreign
matter
lodged
in
instrument.
Out
of
calibration.
High
or
low
vacuum.
Replace
instrument.
Replace
instrument.
Check
vacuum
and
adjust.
Filter
dirty.
Replace
filter.
Incorrect
turn
rate
(electric).
Out
of
calibration.
Replace
instrument.
Aircraft
not
in
coordinated
turn.
Flat
spot
on
ball.
Center
ball in
turn.
Replace
instrument.
Ball sticky.
Ball
not
in
center
when
aircraft
is
correctly
trimmed.
Instrument
will
not
run
(electric).
Instrument
not
level
in
panel.
No
power
to
instrument.
Level
instrument.
Check
circuit
and
repair.
Instrument
malfunction.
Replace
instrument.
INSTRUMENTS
Issued:
8/17/72
2L3