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will cause the display to go blank.
10. LO altitude warning key Pressing key activates MFK for key entering desired lower altitude (AGL)
limits. The designated altitude is displayed left of the key. When altitude limit
is exceeded, display will flash and a 3 Hz audio tone will sound in the
headset.
11. Radar altimeter scale Vertical scale readout of altitude, AGL, from 0 to 200 feet as detected by the
radar altimeter. Tape indicator blanks from scale above 200 feet and
reappears descending through 180 feet.
WARNING
The radar altimeter is not an obstacle warning radar. During NOE or terrain
operations, visual contact with the ground is mandatory. Radar altimeter
signal is taken directly under the helicopter. LO altitude warning at
altitudes less than 50 feet may not occur early enough to allow for
corrective action when banking the helicopter or crossing rapidly rising
terrain.
12. Present position Continuously updated present position shown in eight-digit UTM or LAT/
LONG. Not displayed when EGI is aligning.
13. PP key Calls up or deletes display of present position coordinates.
14. Waypoint distance Displays designator number of and distance to waypoint listed. This is the
waypoint selected on the flight plan for navigation to a direct waypoint if
selected.
15. Airspeed indicator Displays knots indicated airspeed (KIAS) of the helicopter.
NOTE
The pilot may overlay MMS Video while in the VSD mode (paragraph 4-2). To
initiate MMS Video overlay on the VSD, activate the MMS mode switch on the
pilots MFD or activate the Display Select Switch twice. (MMS turret control
remains with the CPG.) Symbology and video intensity switches on the CPG
Auxiliary Panel. To exit MMS/VSD overlay mode, MMS mode switch or Display
Select Switch is activated again (one time).
Figure 3-45. Vertical Situation Display (VSD) Page (Sheet 2 of 2)
3-88
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
HSD MMS COMM
2
3
0.2 KM
7CP
PP
300 330 N 030 060 E
HI
LO
25
HI
60
90
1
4
VSD
PK-9500-0500
8
HOVER BOB-UP
2900
200 PPH
5 1.6 HR
DEGRADED
6
406075-1533-3
J3062
CONTROL/INDICATOR FUNCTION
1. Acceleration cue Shows rate of acceleration.
2. Velocity vector Shows velocity and direction of movement of helicopter. Full scale to the
edge of the screen is approximately 7 knots.
3. Reference crosspoint Stationary crosshairs at the center of the display that represent the
helicopter.
4. Position box (bob-up Depicts desired or starting position over the ground and represents
mode only) approximately 8 feet.
5. PP key Calls up or deletes display of present position coordinates. Fuel burn
rate and time remaining.
6. DEGRADED (bob- Displayed when NAV mode is not in GPS/INS or NOV FOM > 1.
up mode only)
Figure 3-46. Hover Bob-Up Mode Page
3-89
TM 1-1520-248-10
5. POS key  Press. System is activated to prior to shutdown from ground idle AND the
accept new Coordinates. Enter three digit aircraft must not be moved from that
alphanumeric UTM zone identifier followed by position prior to the next system power up.
the two alpha and eight numeric coordinates
of the alignment position. Coordinates will 14. MAG HDG  Required for SHIP ALGN only.
display in POS block of MFD. Enter magnetic heading of naval vessel.
6. ENTER key  Press. Coordinates will be
entered into memory. 15. SHIP ALGN  Select and press after
entering MAG HDG.
7. DATUM key  Press if datum has changed
or is not entered. System is activated to accept new datum. 3-76. ENTERING WAYPOINT INTO WAYPOINT
LIST.
NOTE
1. HSD key  Press. HSD page will display.
Ensure datum is entered before aligning
system. 2. WPT LIST key  Press. WPT LIST page will
display.
8. ENTER key  Press. Datum code will be
entered into memory.
3. NEW WPT key  Press. NEW WAYPOINT
NOTE page will display.
The system will assume the elevation NOTE
entered in UTM is in meters unless the
elevation is followed by an F. In that case, System will automatically fill WPT DES with
the system will automatically convert the numerical i d e n t i f i e r of next available
data entered in feet to meters. In LAT/ waypoint register. Alpha identifier should be
LONG, elevation is assumed to be entered added. If no numeric value is displayed, all
in feet unless followed by an M. In that waypoint registers are filled, and numeric
case, the systems will automatically convert i d e n t i f i e r must be entered. When a
　
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