PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 4
Nov 30/06
3G12
34-10-00
3. Altimeter
NOTE: For airplanes equipped with the Avidyne Entegra EFIS, the primary altimeter is the Primary
Flight Display (PFD).
A. Description and Operation
The altimeter indicates pressure altitude in feet above sea level. The indicator has three pointers
and a dial scale. The long pointer is read in hundreds of feet, the middle pointer in thousands of feet
and the short pointer in ten thousands 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 to
compensate for variation from standard sea level pressure. The altimeter is a sealed diaphragm
connected to the pointers through a mechanical linkage. The diaphragm mounting is made of
bi-metallic temperature sensitive strips that compensates for variation from standard temperatures.
The instrument case is vented to the static air system and, as static air pressure decreases, the
diaphragm expands, causing the pointers to move through the mechanical linkage.
B. Troubleshooting
See Chart 2.
NO
TE: If any connections in static system are opened for maintenance, the complete system must
be rechecked per F.A.R. 23.1325.
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