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3.19.1.2 Command Warning Flag. The command warning .ag marked CMD is at the top left of the VSI face (Figure 3-29). It is held from view when initial power is applied to the CIS processor. When any CIS mode selector switch is on, and that navigation system operating properly, the CMD .ag is not in view. During operation, if the navi-gation signal becomes unreliable, or is lost, the NAV .ag will become visible.
3.19.1.3 Glide Slope Warning Flag. A glide slope warning .ag marked GS is on the right face of the indicator (Figure 3-29). The letters GS are black on a red/white stripe background. The warning .ag will move out of view when the ILS receivers are operating and reliable signals are re-ceived.
3.19.1.4 Navigation Warning Flag. A navigation .ag marked NAV is installed on both the VSIs and the HSIs (Figures 3-29 and 3-30) to indicate when navigation sys-
tems are operating and reliable signals are being received. The VSI NAV .ag is marked NAV with a white back-ground and red strips, and is on the lower left side of the indicator. The HSI NAV .ag is within the compass card ring. Both instrument .ags will retract from view whenever a navigation receiver is on and a reliable signal is being received.
3.19.1.5 Course Deviation Pointer. The course devia-tion pointer is on the VSI instrument (Figure 3-29). The pointer works with the course bar on the HSI to provide the pilot with an indication of the helicopter’s position with respect to the course selected on the HSI. The scales rep-resent right or left off course, each dot from center (on course) is 1.25° for ILS, 5° VOR ,TACAN, DPLR, and FM. The pilot must .y into the needle to regain on-course track.
3.19.1.6 Glide Slope Deviation Pointer. The glide slope pointer, on the right side of the VSI (Figure 3-29), is used with ILS. The pointer represents the glide slope posi-tion with respect to the helicopter. Each side of the on-glide slope (center) mark are dots, each dot representing .25° above or below the glide slope.
DECISION MARKER BANK
HEIGHT BEACON ANGLE
ADVISORY ADVISORY SCALE
LIGHT
ROLL
BAR
3.19.1.73.18.1.7 Controls and Indicators. Indicators
CONTROL/
of the VSI are on the face of the instrument. The function
INDICATOR
of each indicator is as follows:
Figure 3-29. Vertical Situation Indicator
CONTROL/ INDICATOR FUNCTION Collective pos-ition indicator
Miniature airplane/ horizon line Provides horizon. reference to arti.cial GA
Bank angle scale Right and left 0°, 10°, 20°, 30°, 45°, 60°, and 90° of bank.
Arti.cial horizon Turn rate indicator Reference of helicopter’s attitude to horizon. 4-minute turn (one-needle width either side of center) 2-minute turn (two-needle width each side of center). DH
Pitch and roll command bars Display to the pilot, control inputs he should make to arrive at a
predetermined slope. course, or glide
BANK ANGLE INDEX
SPHERE
PITCH COMMAND BAR
GLIDESLOPE DEVIATION POINTER
ARTIFICIAL HORIZON
MINIATURE AIRPLANE
PITCH TRIM KNOB
AB0573
SA
FUNCTION
Display to the pilot the position of
the collective relative to where it
should be to arrive at a
predetermined altitude.
Go-around (GA) advisory light will go on whenever the GA switch on the pilot’s or copilot’s cyclic stick is pressed. The light will go off whenever the go-around mode is ended by engaging another mode on the CIS mode selector panel.
Decision height (DH) advisory
light will go on whenever the radar
altimeter is operating and the
altitude indicator is at or below the
radar altitude L (low bug) setting.
CONTROL/ INDICATOR FUNCTION
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