Piper Cherokee Six - Page 507

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
9-24.
TROUBLESHOOTING.
TABLE
IX-III.
GYRO
HORIZON
INDICATOR
Trouble
Bar
fails
to
respond.
Bar
does
not
settle.
Bar
oscillates
or
shimmies
continuously.
Instrument
does
not
indicate
level
flight.
Bar
high
after
180
turn.
Instrument
tumbles
in
flight.
Cause
Insufficient
vacuum.
Filter
dirty.
Insufficient
vacuum.
Incorrect
instrument.
Defective
instrument.
Instrument
loose
in
panel.
Vacuum
too
high.
Defective
mechanism.
Instrument
not
level
in
panel.
Aircraft
out
of
trim.
Normal,
if
it
does
not
exceed
1/16
inch.
Low
vacuum.
Remedy
Check
pump
and
tubing.
Clean
or
replace
filter.
Check
line
and
pump.
Adjust
valve.
Check
part
number.
Replace.
Tighten
mounting
screws.
Adjust
valve.
Replace
instrument.
Loosen
screws
and
level
instrument.
Trim
aircraft.
Reset
regulator.
Dirty
filter.
Line
to
filter
re-
stricted.
Plug
missing
or
loose
in
instrument.
Clean
or
replace
filter.
Replace
line.
Replace
or
tighten
plug.
INSTRUMENTS
Issued:
8/17/72
2K15