Piper Arrow IV Turbo Maintenance Manual page 437

Trouble
Excessive scale error.
Excessive pointer oscil-
lation.
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.
Dull or discolored
markings.
Barometric scale and ref-
erence markers out of syn-
chronism.
Barometric scale and ref-
erence markers out of syn-
chronism with pointers.
Altimeter sticks at altitude
or does not change with
change of altitude.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
CHART 3402. TROUBLESHOOTING (ALTIMETER)
Improper calibration ad-
justment.
Defective mechanism.
Improper venting.
Wrong lubrication or lack of
lubrication.
Out of engagement.
Not tight when altimeter
was reset.
Case gasket hardened.
Age.
Slippage of mating parts.
Drift in mechanism.
Water or restriction in
static line.
2G14
Cause Remedy
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. Replace instrument,
if screw is missing.
Replace instrument.
Replace instrument.
Refer to the latest
AC43.13-1A.
Remove static lines from all
instruments, blow line clear
from cockpit to pitot head.
34-10-02
Page 34-06
Revised: July 24, 1981