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reference lines useful for pitch attitude control. This indicator is
operable and can follow maneuvers through 360° in roll and 360° in
pitch. A knob at the bottom of the instrument is provided for
adjustment of the miniature airplane to the horizon bar for a more
accurate flight attitude indication. The instrument is vacuum driven and
incorporates a red GYRO flag to indicate insufficient vacuum for
operation. Upon start, the flag pulls when vacuum passes
approximately 4 inches Hg differential. If the vacuum differential
approaches 1 inch Hg, the flag drops into view.
Airspeed Indicator
Indicated and true airspeeds are indicated on a dual-scale, internally
lit precision airspeed indicator installed in the pilot’s instrument panel.
The instrument senses difference in static and Pitot pressures and
displays the result in knots on a airspeed scale. A single pointer
sweeps an indicated airspeed scale calibrated from 40 to 220 knots.
The ‘zero’ index is at the 12 o’clock position. A sub-scale aligns true
airspeed with the corresponding indicated airspeed when the altitude/
temperature correction is set in the correction window. A knob in the
lower left corner of the instrument is used to rotate the pressure
altitude scale in the correction window to align the current pressure
altitude with the outside air temperature. Refer to Section 2
(Limitations) for instrument limit markings.
March 2010
Information Manual 7-19
Cirrus Design Section 7
SR20 Airplane Description
Vertical Speed Indicator
Airplane rate of climb or descent in feet per minute is displayed on the
internally lit Vertical Speed indicator installed in the pilot’s instrument
panel. The instrument senses rate of change in static pressure from a
reference pressure and displays the result in climb or descent feet per
minute (FPM). Climb is indicated by clockwise rotation of the pointer
from zero and descent is indicated by counter clockwise rotation. The
‘0’ (zero) reference point is at the 9 o’clock position. The scale is
calibrated from 0 to 2000 FPM in 100-FPM increments in both the ‘UP’
and ‘DOWN’ directions.
Altimeter
Airplane altitude is depicted on a conventional, three-pointer, internally
lit barometric altimeter installed in the pilot’s instrument panel. The
instrument senses the local barometric pressure adjusted for altimeter
setting and displays the result on the instrument in feet. The altimeter
is calibrated for operation between –1000 and 20,000 feet altitude. The
scale is marked from 0 to 10 in increments of 2. The long pointer
indicates hundreds of feet and sweeps the scale every 1000 feet (each
increment equals 20 feet). The short, wide pointer indicates thousands
of feet and sweeps the scale every 10,000 feet (each increment equals
200 feet). The short narrow pointer indicates tens of thousands feet
and sweeps from 0 to 2 (20,000 feet with each increment equal to
2000 feet). Barometric windows on the instrument’s face allow
barometric calibrations in either inches of mercury (in.Hg) or millibars
(mb). The barometric altimeter settings are input through the
barometric adjustment knob at the lower left of the instrument.
Turn Coordinator
The electric turn coordinator, installed in the instrument panel, displays
roll information and provides roll data to the autopilot. Additionally, if
the airplane is equipped with an S-Tec System 20 or System 30
autopilot, the autopilot engage, disengage, mode select, and mode
annunciation are integrated into the turn coordinator display and
control knob. Roll rate is sensed by a single-gimbal, electrically
powered gyro and displayed on the face of the instrument. The display
consists of a symbolic airplane that rotates to indicate turn rate and a
standard glass tube and ball inclinometer. Markings on the instrument
labeled L & R indicate roll for a standard rate turn in the direction
March 2010
7-20 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
indicated. Power for gyro operation is supplied through the 5-amp
TURN COORDINATOR circuit breaker on the Essential Bus. Back-up
power for turn coordinator gyro operation is supplied by a 27-volt
battery pack.
Turn Coordinator Power Switch
The electrical power source for the turn coordinator is controlled
through the ELEC FLT INST PWR switch located immediately below
the turn coordinator. The switch has two positions: NORM and EMER.
When the switch is set to NORM, electrical power for turn coordinator
is supplied through the 5-amp TURN COORDINATOR circuit breaker
　
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