Piper Cherokee Six - Page 510

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
9-32.
TROUBLESHOOTING.
TABLE IX-V.
ALTIMETER
Trouble Cause
Remedy
Excessive scale error.
Excessive
pointer
oscillation.
High
or low
reading.
Setting knob is hard
to turn.
Inner reference marker
fails to move when
setting knob is
rotated.
Setting knob set screw
loose
or
missing.
Cracked or loose
cover glass.
Improper
calibration
adjustment.
Defective mechanism.
Improper venting.
Wrong lubrication or
lack of lubrication.
Out
of engagement.
Not tight when
altimeter
was
reset.
Case gasket hardened.
Replace
instrument.
Replace
instrument.
Eliminate leak in
static
pressure
system
and check
alignment
of
airspeed tube.
Replace
instrument.
Replace
instrument.
Tighten instrument
screw, if
loose.
Re-
place
instrument,
if
screw is missing.
Replace instrument.
Dull or discolored
markings.
Age.
Barometric scale and
reference markers out
of synchronism.
Barometric scale and
reference
markers
out
of synchronism
with
pointers.
Slippage
of mating
parts.
Drift in mechanism.
Replace instrument.
Reset
pointers,
per
AC
43.13-1
Ch. 7.
Revised:
11
4 83
INSTRUMENTS
2K18