THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 4
Feb 19/04
3H18
34-10-00
2. Ver
tical Speed Indicator
A. Description
Vertical speed indicator measures rate of change in static pressure when airplane is climbing or
descending. By means of a pointer and dial this instrument will indicate a rate of ascent or descent
of airplane in feet per minute. But due to lag of the instrument, aircraft will be climbing or
descending before instrument starts to read and instrument will continue to read after aircraft has
assumed level flight. In rough air this should not be considered a malfunction.
NOTE: When any connections in the static system are opened for checking, system must be
rechecked per FAR 23.1325.
B. Troubleshooting
See Chart 1.
CHART 1
TROUBLESHOOTING VERTICAL SPEED INDICATOR
Trouble Cause Remedy
Pointer does not set on zero. Aging of diaphragm. Reset pointer to zero by
means of setting screw. Tap
instrument while resetting.
Pointer fails to respond. Obstruction in static line. Disconnect all instruments
connected to the static line.
Clear line.
Pitot head frozen over.
Water in static line. Check individual instrments
for obstruction in lines.
Obstruction in pitot head. Clean lines and head.
Pointer oscillates. Leak in static lines. Disconnect all instruments
connected to the static line.
Check individual
instruments for leaks.
Reconnect instruments to
static line and test
installation for leaks.
Defective mechanism. Replace instrument.
Vertical speed indicates when Water in static line. Disconnect static lines and
aircraft is banked. blow out lines from cockpit
out to pitot head.
Pointer has to be set before every Temperature compensator Replace instrument.
flight. inoperative.
Pointer cannot be reset to zero. Diaphragm distorted. Replace instrument.
Instrument reads very low Case of instrument broken or Replace instrument.
during climb or descent. leaking.
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