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Horizontal Situation Indicator
• Note •
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 PUSHSET-
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
Revision A5
7-30 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
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-1000 HSI is electrically driven and a red GYRO flag
indicates loss of electrical power. Redundant circuits paralleled
through diodes at the indicator supply DC electrical power for gyro
operation. 28 VDC for the redundant power circuits is supplied through
the 5-amp HSI 1 circuit breaker on the Essential Bus and 5-amp HSI 2
circuit breaker on Main Bus 2.
Serials with Avionics Configuration B - 0002 through 1601, 1603
through 1643 and 1645 through 1662 without PFD: The Sandel
SN3308 combines the functions of an HSI, an RMI, a full color moving
map, a Stormscope display, GPS annunciator, and 3-light marker
beacon indicators. Compass information is derived from a remote
directional gyro and a flux detector. Redundant power sources provide
28 VDC for system operation. Power is supplied through the 5-amp
HSI #1 circuit breaker on the Essential Bus and the 5-amp HSI #2
circuit breaker on Main Bus 2. Either circuit is capable of powering the
Navigation Display.
The full-color display uses a rear-projection system driven by an active
matrix LCD display. The unit uses a halogen lamp as the singular
primary display projection light source. A separate dimming knob for
the display brightness is provided immediately below the display.
The HSI display shows heading and navigation information in a 360°
view similar to a conventional mechanical HSI, or in an EFIS 90° ARC
view. This includes compass card, heading bug, course pointer,
course deviation bar, TO/FROM indicator, glideslope indicator, and
flags. Heading bug and course pointer settings include digital readouts
that make it easy to set precise headings and courses. One button
operation allows primary navigation to be selected from up to four
different sources: two VOR/ILS receivers and two GPS receivers.
Either GPS1 or NAV1 may be selected as primary navigation sources.
Revision A5
P/N 13772-001 7-31
Cirrus Design Section 7
SR22 Airplane Description
Up to two bearing pointers can be displayed and switched to any NAV
receiver including GPS1, GPS2, NAV1, or NAV2. GPS2 and NAV2 can
only be displayed as bearing pointers, not as a primary navigation
source. The display is color-coded to indicate which navigation source
is selected: green for NAV1, yellow for NAV2, and red for GPS.
Auto Slew automatically turns the course pointer in response to
waypoint sequencing or Direct-To navigation from the GPS receiver
eliminating manual course changes at waypoints and reducing pilot
workload.
Heading and Course Sync allows the pilot, with one button, to
automatically set the heading bug directly to his current heading, or to
set the course pointer directly to a VOR station, simultaneously
centering course deviation. Course and heading command outputs for
　
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