CHART 3401. TROUBLESHOOTING (RATE OF CLIMB INDICATOR) (cont)
Trouble Cause Remedy
Pointer oscillates. Leaks in static lines. Disconnect all instruments
connected to the static line.
Check individual instru-
ments for leaks. Reconnect
instruments to static line
and test installation for
leaks.
Defective mechanism. Replace instrument.
Rate of climb indicates Water in static line. Disconnect static lines and
when aircraft is banked. blow out lines from cockpit
out to pitot head.
Pointer has to be set before Temperature compensator Replace instrument.
every flight. inoperative.
Pointer cannot be reset to Diaphragm distorted. Replace instrument.
zero.
Instrument reads very low Case of instrument broken Replace instrument.
during climb or descent. or leaking.
—NOTE—
When any connections in the static system are opened for
checking, system must be rechecked per F.A.R. 23.1325.
SENSITIVE ALTIMETER.
The altimeter indicates pressure altitude in feet above seal level. The indicator has three pointers and a dial
scale; the long pointer is read in hundreds of feet, the middle pointer in thousandths of feet and the short
pointer in ten thousandths of feet. A barometric pressure window is located on the right side of the indicator
dial and is set by the knob located on the lower left corner of the instrument. (Some instruments will have two
barometric pressure windows. The one on the right to indicate inches of mercury and the one on the left to
indicate in millibars.) The altimeter consists of a sealed diaphragm that is connected to the pointers through a
mechanical linkage. The instrument case is vented to the static air system and as static air pressure decreases,
the diaphragm expands, causing the pointer to move through the mechanical linkage.
34-10-02
Page 34-05
Revised: November 6, 1979
2G13
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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