THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 6
Feb 19/04
3H20
34-10-00
CHART 2
TROUBLESHOOTING ALTIMETER
Trouble Cause Remedy
Excessive scale error. Improper calibration adjustment. Replace instrument.
Excessive pointer oscillation. Defective mechanism. Replace instrument.
High or low reading. Improper venting. Eliminate leak in static
pressure system and check
alignment of airspeed tube.
Setting knob is hard to turn. Wrong lubrication or lack of Replace instrument.
lubrication.
Inner reference marker fails to Out of engagement. Replace instrument.
move when setting knob is
rotated.
Setting knob set screw loose or Not tight when altimeter was Tighten instrument screw, if
missing. reset. loose. Replace instrument,
if screw is missing.
Cracked or loose cover glass. Case gasket hardened. Replace instrument.
Dull or discolored markings. Age. Replace instrument.
Barometric scale and reference Slippage of mating parts. Replace instrument.
markers out of synchronism.
Barometric scale and reference Drift in mechanism. Refer to the latest revision
markers out of synchronism of AC43.13-1.
with pointers.
Altimeter sticks at altitude or Water or restriction in static Remove static lines from all
does not change with change of line. instruments, blow line clear
altitude. from cockpit to pitot head.
Altimeter charges reading Water in static line. Remove static lines from all
as aircraft is banked. instruments, and blow line
clear from cockpit to pitot
head.
Altimeter requires resetting Temperature compensator Replace instrument.
frequently. inoperative.
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