34 - 12 - 00
Page 34 - 06
Reissued: August 1, 1986
2D14
CHART 3402. TROUBLESHOOTING (ALTIMETER)
Excessive scale error Improper calibration ad- Calibrate or replace
justment. instrument.
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. Does not require repair.
markings.
Barometric scale and ref- Slippage of mating pans. Replace instrument.
erence markers out of syn-
chronism.
Barometric scale and ref- Drift in mechanism. Refer to the latest revision
erence markers out of of AC 43.13-1.
sync with pointers.
Altimeter sticks at altitudc Water or restriction in Remove static lines from all
or does not change with static line. instruments, blow line clear
chatlge of altitudc. from cockpit to pitot head.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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