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the choice of accepting or rejecting navigation updates to error, it should not be used as a sole position
when the navigation system error exceeds 300 meters. reference and is not adequate for obstacle avoidance.
This function is to protect the navigation system in the
event of operator error.
3 - 7 5 . ENTERING I N I T I A L LOCATION ACCEPT the update if: COORDINATE AND ELEVATION INFORMATION
Coordinates are correct and you have found the right INTO SYSTEM.
landmark.
REJECT the update if: NOTE
(1) The coordinates are wrong. When helicopter is shut down, NAV ALIGN
(2) The wrong waypoint is selected in the flight is lost.
plan.
1. INIT button  Press on MFD auxiliary panel
(3) The system has been updated recently and located below MFD. INITIAL PAGE 1 will
has been performing well (it is probably wise to reject display.
an update with large error in this case).
2. NAV ALIGN key  Press on MFD. NAV
3-73. HOVER MODE. ALIGN page will display.
The hover mode is a submode of the VSD page (fig. 3-
45). The hover mode is entered from the VSD page by NOTE
pressing the HVR key on the MFD or pressing the
DSPL SEL switch on the pilot cyclic grip to the left one This procedure uses UTM coordinates. The
time. This mode displays the same data as the VSD, basic procedure is the same for LAT/LONG
except the attitude presentation is replaced by a coordinates, substituting LAT/LONG data for
reference crosspoint, acceleration cue, and velocity UTM.
vector. Inputs for this display are taken from the EGI.
The primary function of this display is to give the pilot a 3. POS block  Check for correct current
hover movement reference. The reference crosspoint location.
represents the helicopter and is stationary at the center
of the screen. The acceleration cue shows direction NOTE
and magnitude of the horizontal movement of the
helicopter. The EGI will automatically begin a standard
4-minute alignment to the aircraft present
3-74. HOVER BOB-UP MODE. position. No user action is required unless
new alignment position is desired.
a. The hover bob-up mode (fig. 3-46) is a submode
of the hover mode and can only be called up from that 4. UTM LAT/LONG key  Press as required to
mode. This mode is identical to the hover mode except place system in desired mode. Box indicating
that it also displays a position box. The position box mode will alternate between UTM and LAT/
depicts a desired position over the ground. As the LONG each time key is pressed.
3-86
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
HSD MMS COMM
4
300 330 N 030 060 E
90
20
10
10
20
90
0.7 NM
29T
PP
N 32 58.07
W114 16.11
HI
100
LO
25
HI
15
14
13
12
VERTICAL SITUATION DISPLAY
78
HVR
406075-1475
J1139
1 2 3
5
6
7
8
9
10
11
CONTROL/INDICATOR FUNCTION
1. Waypoint bearing caret Indicates bearing to the next waypoint in the flight plan or direct waypoint if
selected. Not displayed if EGI heading is unreliable.
2. Magnetic heading tape Displays magnetic heading 90° left and right of the nose of the helicopter.
Helicopter heading is indicated at the center of the tape at the zero bank
mark of the attitude indicator. Not displayed if EGI heading is unreliable.
3. MMS bearing indicator Indicates line-of-sight bearing of the mast mounted sight. Not displayed if
EGI heading is unreliable.
4. Barometric altimeter Displays barometric altitude, MSL, of helicopter in 10-foot increments.
Altimeter settings are made on standby altimeter. If signal is lost from pitotstatic
system, display will blank.
5. Attitude indicator Displays pitch and roll attitude reference.
6. HI/LO Displays a warning (HI/LO) when the limits set with the HI or LO altitude
warning keys are exceeded.
Figure 3-45. Vertical Situation Display (VSD) Page (Sheet 1 of 2)
3-87
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
7. Rate of climb indicator Displays vertical rate of climb of helicopter up to ± 1000 feet per minute.
Cursor travels up and down radar altimeter scale with the 100 foot mark
being zero rate of climb.
8. HI altitude warning key Pressing key activates MFK for entering desired upper altitude (AGL) limit.
The designated altitude is displayed left of key. When altitude limit is
exceeded, display will flash.
9. Radar altimeter readout Displays digital readout of altitude, AGL, from 0 to 1425 feet as detected by
the radar altimeter. Going above 1425 feet or a failure of the radar altimeter
　
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