Extra 300/SC - Page 253

CHAPTER 34
PAGE 5
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 16. June 2008
34-10-02 Altimeter
Description and Operation
The altimeter is designed to measure pressure changes of the
atmosphere by means of an aneroid capsule, the pressure
changes corresponding to changes in altitude. In this
instrument the shaft of pinion drives via gearwheels the
pointer shaft of the large pointer. Further gearwheels are
used to move the small pointer. The altimeter has a scale
marked in feet (ft.). Three pointers provide an indication of
the altitude; each full turn of the large pointer reads 1,000
feet, each full turn of the middle pointer 10,000 feet. By
turning the knob at the bottom left of the instrument, the
barometric pressure reading is set in millibars.
Barometric range: 946 thru 1050 millibars
28.1 thru 30 inHg
Reading range: -1,000 thru 20,000 feet
Temperature range:-55°C thru +70°C
Removal/Installation
1 Remove the vinyl tube.
2 Remove the attachment bolts and nuts.
3 Hand the altimeter under the instrument panel and remove.
4 Install in reverse sequence of removal.
5 Perform an operation test.
FLIGHT ENVIRONMENT DATA