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on the Essential Bus. Should the normal electrical system fail, setting
the switch to EMER will power the turn coordinator through a 27-volt
battery pack. The switch is left in the NORM position for all normal
operations. The batteries must be replaced at specified intervals
based upon the date appearing on the battery (refer to SR-20 Airplane
Maintenance Manual) and after each use to power the turn
coordinator.
Directional Gyro
The airplane is equipped with a directional gyro in the standard
configuration. If a directional gyro is not installed the airplane will be
equipped with an HSI.
The directional gyro, in the left instrument panel, displays airplane
heading by rotating a compass dial in relation to a fixed simulated
airplane image and lubber line. The compass dial rotates counter
clockwise for right turns. A knob, labeled HDG REF, on the lower right
corner of the instrument is used to set the day-glo yellow heading bug.
The compass dial should be set in agreement with the magnetic
compass just prior to takeoff. As the gyro will precess slightly over a
period of time, the directional gyro compass dial should be re adjusted
occasionally on extended flights.
To adjust compass card:
1. Push and hold knob at lower left corner of instrument.
2. While holding knob in, rotate knob to adjust gyro compass dial
with current magnetic heading.
3. Release knob.
March 2010
Information Manual 7-21
Cirrus Design Section 7
SR20 Airplane Description
Course Deviation Indicator
The Course Deviation Indicator (CDI) displays course deviation from a
VOR, Localizer (LOC) or Glideslope when 'VLOC' is the selected
navigation source on the GNS 430 and displays GPS track deviation
when 'GPS' is the selected navigation source. Navigation source
selection is made using the CDI button on the GNS 430 control.
The instrument is a dual deviation bar VOR/LOC/Glideslope course
deviation indicator. The vertical line displays VOR/LOC or GPS track
deviation against a 5-dot scale. The horizontal line displays glideslope
deviation against a 5-dot scale. The indicator incorporates TO/FROM
annunciation, NAV flag, and GS flag. An OBS knob is used to
manually rotate the azimuth card to the desired bearing. 28 VDC for
instrument lighting is supplied through the 2-amp INSTRUMENT
LIGHTS circuit breaker on Main Bus #1.
Horizontal Situation Indicator (Optional)
In optional configurations, the airplane is equipped with either a
vacuum powered Century NSD-360 HSI, an electric powered Century
NSD-1000 HSI, or a electric powered Sandel 3308 Navigation Display.
The displays and operation of the Century NSD-360 and NSD-1000
HSI's are identical with the singular difference being the power source
for gyro operation.
Century NSD-360 or NSD-1000 HSI (Optional)
The NSD-360 or NSD-1000 Horizontal Situation Indicator (HSI), in the
left instrument panel, provides gyro stabilized, magnetically slaved,
heading information, a pictorial VOR/LOC display with a conventional
course arrow, and glideslope presentation. The HSI displays airplane
heading by rotating a compass dial in relation to a fixed simulated
airplane image and lubber line. The HSI directional gyro, which drives
the compass dial, is slaved to a flux detector in the right wing through
an amplifier under the copilot's floor. A FREE GYRO-SLAVE switch,
immediately below the display, allows the pilot to select either Free
Gyro mode or Slave mode. In Slave mode, the gyro is slaved to the
flux detector. In Free Gyro mode, the gyro must be manually set to the
airplane's magnetic compass using the PUSH-SET-CARD knob in the
lower right corner of the instrument. The course is set using the
Course (Arrow) knob in the lower left corner of the instrument. The HSI
March 2010
7-22 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
course and heading outputs provided to the autopilot to allow NAV/
LOC/GPS course tracking or to track a preset heading.
The HSI incorporates conventional warning flags. The HDG (Heading)
flag will be out of view whenever the instrument is receiving sufficient
electrical power for operation. The NAV (Navigation) flag will be out of
view when a VOR or LOC frequency is tuned in the NAV1 receiver and
a reliable signal is present. The GS (Glideslope) flag will be out of view
when an ILS frequency is tuned on the Nav 1 receiver and a reliable
GS signal is present.
The NSD-360 HSI gyro is vacuum powered and a red GYRO flag
indicates insufficient vacuum for gyro operation. 28 vdc for HSI
operation is supplied through the 2-amp HSI circuit breaker on the
　
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