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Reissued: August 1, 1986
2D15
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
CHART 3402. TROUBLESHOOTING (ALTIMETER) (CONT)
Altimeter changes 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 re- Temperature compensator Change instrument.
setting frequently. inoperative.
—NOTE—
When any connections in static system are opened for checking,
system must be rechecked per F.A.R. 23.1325.
AIRSPEED INDICATOR
The airspeed indication is the differential pressure reading between pitot air pressure and static air
pressure. In this instrument, the diaphragm is vented to the pitot air source and the case is vented to the static
air system. The instrument dial is calibrated in knots, and also has the necessary operating markings (colored
arcs) indicating safe operating ranges of the airplane.
CHART 3403. TROUBLESHOOTING (AIRSPEED TUBES AND INDICATOR)
Pointers of static instru- Leak in instrument case or Check for leak and seal.
ments do not indicate in pitot lines.
properly.
Pointer of instrument Defective mechanism. Replace instrument.
oscillates.
Instrument reads high. Internal fault. Replace instrument.
Leaking static system. Find leak and correct.
Trouble Cause Remedy
Trouble Cause Remedy
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