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MB  Marker beacon (MB) advisory light will go on and the associated marker beacon tone will be heard, depending upon volume control setting, when the helicopter is over the marker beacon transmitter. 
Glide slope pointer  Displays to the pilot the position of the ILS glide slope relative to the helicopter. Pointer above center indicates helicopter is below glide path. 
Course deviation pointer  Displays to the pilot the position of the course reference (VOR, LOCTACAN, DPLR/GPS, FM HOME) relative to the helicopter. 
ATT warning .ag  Indicates loss of vertical power or VSI malfunction.  gyro 
NAV warning .ag  Indicates loss, or unreliable signal indication. 
GS warning .ag  Indicates loss, or unreliable signal indicator. 
PITCH trim knob  Adjust arti.cial horizon up (climb) from at least 4°, no more than 10° or down (dive) from at least 8°, no more than 20°. 
ROLL trim knob  Adjust arti.cial horizon right or left from at least 8° to no more than 20°. 

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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