Horizontal Situation Indicator - Cirrus SR22 Pilot Operating Handbook

Cirrus Design
SR22
the azimuth card to the desired bearing. 28 VDC for lighting is supplied
through the 2-amp INST LIGHTS circuit breaker on Main Bus 1.
Serials with Avionics Configuration B - 0002 through 1601, 1603
through 1643 and 1645 through 1662 without PFD: The Course
Deviation Indicator (CDI) displays navigation information from GPS 2
(Garmin GNS 430). Navigation source selection is made using the CDI
button on the GPS 2 control. The CDI displays course deviation from a
VOR or Localizer (LOC) and Glideslope when 'VLOC' is the selected
navigation source and displays GPS track deviation when 'GPS' is the
selected navigation source. The instrument has two deviation bars.
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 INST LIGHTS circuit breaker on Main Bus 1.

Horizontal Situation Indicator

Serials 0435 and subsequent with PFD: The Horizontal
Situation Indicator is integrated into the PFD.
Serials with Avionics Configuration A - 0002 through 1601, 1603
through 1643 and 1645 through 1662 without PFD: The Century NSD-
1000 is a conventional HSI that provides gyro stabilized, magnetically
slaved, heading information, a pictorial VOR/LOC display with a
conventional course arrow, and glideslope presentation. The
instrument 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, 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 course and heading outputs provided to the
P/N 13772-001
Revision A5
• Note •
Section 7
Airplane Description
7-29