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used to complete a partial CV/GND alignment. At takeoff with a partial alignment the INS platform
should already be leveled and no INS ATT caution displayed. All that needs to be done is to place the
INS mode select knob to IFA with the appropriate PVU option selected until an OK is displayed.
24.2.5.4.6 Gyro Recovery. A gyro recovery is actually an attitude only INS in which reliable INS
attitude data is recovered. Since only attitude information is recovered, FCC air data and radar inputs
are not required. A gyro recovery is initiated by placing the ATT select switch to AUTO or INS and
maintaining straight and level unaccelerated flight. The INS mode select knob is set to OFF for 5
seconds and set to the GYRO position. As the platform levels the INS ATT caution clears and INS
attitude data is replaced with standby reference indicator data on the HUD. A flashing velocity vector
replaces the waterline symbol until GPS velocity data is valid. If takeoff occurs before an adequate
alignment is complete the gyro mode is available.
24.2.6 NAVCK Display. The NAVCK (INS check) display allows analysis of INS/GPS/air data
function reliability. The velocity check more readily indicates an INS vertical loop problem. INS, GPS
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and air data function vertical velocity is periodically compared and when an excessive disagreement is
sensed the MASTER CAUTION light and tone come on and the NAV VVEL caution is displayed.
The display is selected on the DATA sublevel display by pressing the NAVCK option. The top
portion of the display consists of INS, GPS and air data function velocities. The bottom portion
consists of wind velocities, best available MC groundspeed (if valid) and best available MC true
airspeed (if not zero). INS, GPS and air data function velocity components are displayed on the
NAVCK display even if invalid. If an INS, GPS or FCC air data function (ADC) data is invalid a # is
displayed to the right of the invalid data along with # INVALID at the bottom of the format. If wind
velocity is estimated, an * (asterisk) is displayed to the right of the wind velocity components along
with *EST at the bottom of the format, see figure 24-6.
24.2.7 Waypoints, Offset Aimpoints (OAP), and Offsets. A waypoint is a geographical point for
which latitude, longitude, and elevation are stored in the MC. An OAP is a waypoint which has an
offset associated with it. An offset is a point defined by bearing and range from the OAP along with
elevation of the point (offset).
Mission data such as waypoints and offsets may be entered using the Data Transfer Equipment
(DTE) and the mission initialization display or manually.
24.2.7.1 Waypoint/Offset Aimpoint Programming. Waypoint/OAP data is entered by selecting the
DATA option on the waypoint data top level display. The waypoint data display is automatically
initialized with WYPT boxed. This display shows the current waypoint/OAP data: waypoint lat/long
position, UTM Grid coordinates, and elevation; offset range, GRID, bearing, and elevation (if
applicable). Waypoint/OAP data is entered by selecting an up/down arrow to select the desired
waypoint/OAP and the UFC option to initialize the UFCD for waypoint/OAP data entry. On the
UFCD the following selections complete the selection: POSN option to enter lat/long data, ELEV
option to enter elevation data, and O/S option to enter offset data (offset range, bearing, UTM grid
coordinates and elevation). Offset data is in relation to the offset aimpoint. Waypoint/OAP data is
entered through the UFCD keypad, with a maximum of 60 waypoints (0 to 59) available for
programming. See figure 24-8, sheets 1 and 2.
Figure 24-6. NAVCK Display
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Waypoint data can also be entered using the map slew method by selecting WYPT on the DATA
option display, and actuating the SLEW button. Pressing the TDC and slewing the map to the desired
lat/long position under the waypoint symbol locates the point.
NOTE
Lat/long and elevation data on the MPCD reflect the current map
position under the waypoint symbol as the map is being slewed.
Upon release of the TDC the current waypoint data is entered for the map position under the
waypoint symbol. Selecting the next waypoint number as required (using the waypoint increment/
decrement option buttons) allows further waypoint data entry.
Another map slew method is to select WYPT on the DATA option display, actuating the SLEW
button, and pressing and holding the TDC to slew the map to the desired lat/long position under the
waypoint symbol. This position is entered by selecting another waypoint (using the waypoint
increment/decrement option buttons). Continuing to hold the TDC, the map is slewed as required, and
　
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