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indicated in kilometers per hour or nautical compartment and is hard mounted to the helicopter.
miles per hour if in LAT/LON. The EGI is a self-contained, all-attitude navigation
system that provides outputs of linear and angular
d. Drift corrected steering data to selected acceleration, linear and angular velocity, position,
waypoints. attitude (roll, pitch, and platform azimuth), magnetic
and true heading, altitude, body angular rates, time
e. Aircraft angular velocities. tags, and Universal Time Coordinated (UTC)
synchronized time. The EGI receives power from the 28
Vdc power assured bus. Circuit protection is provided
3-49. POSITION FIXING. by a circuit breaker located on the aft overhead console
Accurately provides the helicopter present position in circuit breaker panel (see figure 2-8).
Military Grid Reference System (MGRS) coordinates
and latitude/longitude coordinates, and altitude in The main functional components of the EGI are the
meters and feet above mean sea level (MSL). System Processor Module, the Inertial Measurement
Module, the Embedded GPS Receiver Module, and the
Power Supply Module. Navigational data, GPS satellite
3-50. TARGET LOCATION, ALTITUDE, AND system ephemeris and almanac data, and system
BEARING. security data are stored in non-volatile memory (NVM).
NVM i s provided a keep-alive voltage from a
Provides target location in latitude and longitude or replaceable battery located in the battery compartment
MGRS coordinates and altitude in meters or feet above on the front of the EGI.
3-46
TM 1-1520-248-10
3-54. INITIAL PAGE 1. MANUAL align is user selectable both during and after
the AUTO align process, and will execute a standard,
The INITIAL PAGE 1 (fig. 3-25) displays on the MFD 4-minute alignment using data entered by the user at
whenever power is applied to the CDS during start or the POS, DATUM, and ELEV keys. Alignment is
when INIT button on pilot (fig. 2-6) or CPG auxiliary indicated by the boxed text MANUAL to the left of R-1
panel (fig. 2-7) is pressed. Navigation system and appearance of the text GC ALIGN or IF ALIGN at
alignment, control, and mode of operation are accessed the bottom center of the NAV ALIGN page. Completion
by pressing the NAV ALIGN key to call up the NAV of alignment is indicated by disappearance of both the
ALIGN page. All warning, caution, and advisory box around the text MANUAL and the text at the bottom
messages are active with all navigation displays. center of the NAV ALIGN page.
FAST align is user selectable during the AUTO align
3-55. NAV ALIGN PAGE (UTM). process and will execute a 30-second alignment to the
most recently stored aircraft position, provided that the
The NAV ALIGN page (UTM) (fig. 3-26 and fig. 3-27) is aircraft has not been moved from that position.
called up from the INITIAL PAGE 1. This page is used Alignment is indicated by the boxed text FAST to the
to control and align the navigation system. The NAV left of R-2 and appearance of the text SH ALIGN at the
ALIGN page UTM is used when eight-digit MGRS bottom center of the NAV ALIGN page. The required
coordinates are to be used for alignment. This mode aircraft position is stored immediately prior to aircraft
allows entry of present position grid coordinates, shutdown (from ground idle) by inputting the MFD
datum, and elevation in meters. Allowance for entry of displayed present position into the POS field on the
ships magnetic heading (required ONLY for SHIP NAV ALIGN page and selecting MANUAL align.
ALGN) is also provided. Three methods of alignment
may be chosen: MANUAL, FAST, and SHIP ALGN. SHIP ALGN is also user selectable both during and
AUTO align is automatically selected by the system after the AUTO align process and is intended to allow
upon power up and will execute a standard, 4-minute for system alignment when engaged in shipboard
alignment. The automatic alignment mode is indicated operations. The magnetic heading of the vessel is input
by the boxed text AUTO to the left of R-1 and the in the MAG HDG field on the MFD, and then the SHIP
presence of the text GC ALIGN or IF ALIGN at the ALGN key is pressed (SHIP ALGN will not function
bottom center of the NAV ALIGN page (no position data without a vessel magnetic heading value). The system
is displayed on the NAV ALIGN page during an AUTO will enter the SHIP ALGN mode, as indicated by the
align process). Completion of alignment is indicated by appearance of the text IF ALIGN at the bottom center
disappearance of both the box around the text AUTO of the NAV ALIGN page. Completion of alignment is
and the text at the bottom center of the NAV ALIGN indicated by disappearance of the text at the bottom
page. center of the NAV ALIGN page.
3-47
　
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