P/N 13999-002 Info 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
September 2011
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