3.19.2 Horizontal Situation Indicator. Two HSIs (Figure 3-30) are installed on the instrument panel, one in front of each pilot. The HSI consists of a compass card, two bearing-to-station points with back-course markers, a course bar, a KM indicator, heading set (HDG) knob and marker, a course set (CRS) knob, a COURSE digital read-out, a to-from arrow, a NAV .ag, and a compass HDG .ag. The HSIs operating power is taken from the ac essen-tial bus through a circuit breaker marked HSI PLT/CPLT.
3.19.3 Controls and Indicators. Controls of the hori-zontal situation indicators (Figure 3-30) are as follows:
CONTROL/ INDICATOR
Compass card
COURSE set display
Bearing pointer No. 1
Bearing pointer No. 2
Course deviation bar
CRS knob
KM indicator
HDG knob
FUNCTION
The compass card is a 360° scale that turns to display heading data obtained from the compass control. The helicopter headings are read at the upper lubber line.
Displays course to nearest degree. Indicates same as course set pointer.
The pointer operates in conjunction with Doppler/GPS or TACAN. Indicates magnetic bearing to waypoint or TACAN station selected.
The pointer operates in conjunction with selected VOR , TACAN, or ADF receiver. The pointer is read against the compass card and indicates the magnetic bearing to the VOR or ADF station.
This bar indicates lateral deviation from a selected course. When the helicopter is .ying the selected course, the course bar will be aligned with the course set pointer and will be centered on the .xed aircraft symbol.
Course set (CRS) knob and the course set counter operate in conjunction with the course pointer and allow the pilot to select any of 360 courses. Once set, the course pointer will turn with the compass card and will be centered on the upper lubber line when the helicopter is .ying the selected course.
Digital distance display in kilometers (KM) to destination waypoint, or TACAN station.
Heading set (HDG) knob operates in conjunction with the heading select marker, allows the pilot to select any one of 360 headings. Seven full turns of the knob produces a 360° turn of the marker.
COURSE NO. 1 BEARING LUBBER HDG SET POINTER LINE SELECT
DISTANCE SHUTTER
DISTANCE TO GO DISPLAY
NO. 2 BEARING POINTER
HEADING SET KNOB COURSE SET DISPLAY
HDG WARNING FLAG
COMPASS CARD
COURSE SET KNOB
NAV FLAG TO.FROM COURSE
ARROW DEVIATION BAR AB0574
SA
No. 1 dc primary bus through a circuit breaker, marked
CONTROL/ FUNCTION CPLT MODE SELECT.
INDICATOR HDG warning Visible when a failure occurs in the
NOTE
.ag magnetic compass system. The switches on the VSI/HSI and CIS mode
To-From arrow To-from arrow indicates that the helicopter is .ying to or away from a selected VORor TACAN. select panels may change state when the caution/advisory panel BRT/DIM-TEST switch is set to TEST. The original indica-
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