FLIGHT
INSTRUMENTS
AIRPLANE
OPERATIONS
MANUAL
2-17-20
Page
4
Code
01
REVISION 37
AOM-145/1114
STANDBY ALTIMETER
The Standby Altimeter consists of an aneroid barometer, with the
altitude scale graduated in feet, and the barometric adjustment scale
graduated in inches of mercury or hectopascals.
The Pitot/Static tube 3 provides static pressure to this indicator.
This instrument receives 5 V DC for internal lighting.
1 - ALTITUDE COUNTER
Indicates pressure altitude.
Ranges from 1000 ft to 50000 ft with the following increments:
Right drum counter is numbered at 100 ft intervals.
Center drum counter is numbered at 1000 ft intervals.
Left drum counter is numbered at 10000 ft intervals.
First digit (left drum counter) is replaced by an orange and white
crosshatched area for negative altitudes, and by a black and
white crosshatched area for altitudes below 10000 ft.
2 - SCALE
Full dots every 100 ft.
Half dots every 20 ft.
3 - ALTIMETER SETTING COUNTER
Displays the adjusted reference pressure.
Ranges from 22.15 to 31.00 inHg (750 to 1050 hPa), with
0.01 inHg (1hPa) increments .
4 - BARO KNOB
Allows setting the reference pressure.
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