Piper SARATOGA PA-32-301 Maintenance Manual page 365

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 3402. TROUBLESHOOTING (ALTIMETER) (cont)
Trouble
Cause
Remedy
Altimeter changes reading
as aircraft is banked.
Altimeter requires re-
setting frequently.
Water in static line.
Temperature compensator
inoperative.
Remove static lines from all
instruments, and blow line
clear from cockpit to pitot
head.
Change instrument.
- NOTE -
When any connections
in the static system are openedfor 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 ram 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
Remed
Pointers of stick instru-
ments do not indicate
properly.
Pointer of instrument
oscillates.
Instrument reads high.
Leak in instrument case or
in pitot lines.
Defective mechanism.
Pointer not on zero.
Check for leak and seal.
Replace instrument.
Replace instrument.
Leaking static system.
2D24
Find leak and correct.
34-10-03
Page 34-06
Revised: August 9. 1984