Piper Cherokee Six - Airspeed Tubes and Indicator; Troubleshooting

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
9-36.
TROUBLESHOOTING.
TABLE
IX-VI.
AIRSPEED
TUBES
AND
INDICATOR
Trouble
Pointers
of static
instruments
do not
indicate
properly.
Pointer
of instrument
oscillates.
Instrument
reads
high.
Instrument
reads
low.
Airspeed
changes
as
aircraft
is banked.
Cause
Leak
in instrument
case
or in pitot
lines.
Defective
mechanism.
Pointer
not on
zero.
Leaking
static system.
Pointer
not
on zero.
Leaking
static
system.
Pitot
head not
aligned
correctly.
Water
in pitot
line.
Remedy
Check
for
leak
and seal.
Replace
instrument.
Replace
instrument.
Find
leak
and
correct.
Replace
instrument.
Find
leak
and
correct.
Realign
pitot
head.
Remove
lines
from
static
instruments
and
blow
out lines
from
cockpit
to pitot head.
I
NOTE
When
any
connections
in
static
system
are
opened
for
checking,
system
must
be
checked
per
F.A.R.
23.1325.
9-37.
REMOVAL
AND
REPLACEMENT.
Refer
to
Paragraph
9-74
of
this
section.
INSTRUMENTS
Revised:
6/18/76
2K20