Piper PA-28RT-201T - Page 437

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