CHART 3402. TROUBLESHOOTING (ALTIMETER) (cont)
Trouble Cause Remedy
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 the static system are opened for
checking, system must be rechecked per F.A.R. 23.1325.
AIRSPEED INDICATOR.
The airspeed indicator provides a means of indicating the speed of the airplane passing through the air. The
airspeed indication is the differential pressure reading between pitot air to pressure and static air pressure. This
instrument has the diaphragm vented to the pitot air source and the case is vented to the static air system. As
the airplane increases speed, the pitot air pressure increases, causing the diaphragm to expand. A mechanical
linkage picks up this motion and moves the instrument pointer to the indicated speed. The instrument dial is
calibrated in knots and also has the necessary operating range markings for safe operation of the airplane.
CHART 3403. TROUBLESHOOTING (AIRSPEED TUBES AND INDICATOR)
Trouble Cause Remedy
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. Pointer not on zero. Replace instrument.
Leaking static system. Find leak and correct.
34-10-03
Page 34-07
December 1, 1978
2G15
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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