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after selecting CV, the system must be left off for a minimum of 5
seconds.
24.2.3 Aided INS (AINS) Mode. With GPS selected and operating, aided INS (AINS) is the primary
position keeping mode. In AINS mode the INS and GPS are aiding each other to provide an optimal
navigation solution. AINS is selected by placing the INS mode switch to IFA after a GND or CV
alignment. The position keeping mode remains AINS unless GPS satellites are lost, an INS or GPS
failure occurs, or the pilot manually chooses a different position keeping source. AINS horizontal
position is updated every 8 seconds; velocities, updated every 4 seconds.
24.2.4 INS BIT. Refer to Chapter 2, Status Monitoring Subsystem, INS BIT.
24.2.5 INS Alignment Modes. INS alignment modes which can be selected using the INS mode
selector knob are CV (carrier alignment), GND (ground alignment), and IFA (radar or GPS inflight
alignment).
24.2.5.1 Incomplete Alignment Advisory. An incomplete alignment advisory ALGN is displayed
when the INS switches to NAV, either automatically or manually, without a complete alignment.
24.2.5.1.1 RF/CBL (SINS) Alignment. With the RF/CBL (SINS) alignment, the INS automatically
compensates for the difference between the aircraft deck position and SINS position. To perform this
alignment the parking brake must be set and the INS mode selector knob switched to CV. When this
is done the INS and data link are turned on, the CV align display appears on the HSI, and TIME on
the CV align display begins to increment. For an RF alignment, information is received by radio
frequency and RF is displayed to the right of CV on the CV align display. The alignment frequency is
displayed on the UFCD scratchpad and may be changed using the UFCD keypad.
When a cable is connected to the aircraft, information is received on the cable and CBL is displayed
to the right of CV on the CV align display. RF/CBL flashes until SINS data becomes valid. During the
first 1 to 2 minutes of alignment, NO ATT is displayed to the right of QUAL: on the CV align display.
A1-F18EA-NFM-000
VII-24-11 ORIGINAL
While the platform is being leveled a total of 10 waypoints can be received. When 10 waypoints have
been received WYPTS is displayed below the time readout. If all waypoint data is not received, NO
WYPTS is displayed below the time readout. Reception of waypoint data is not required for the
alignment to proceed. NO ATT is replaced with a quality number after the platform has leveled, and
the INS begins to determine true north. The quality number is an estimate of present position
accuracy. See figure 24-3.
When INS velocities become valid the quality number is replaced with OK and the INS may be
switched to NAV. When NAV is selected the alignment display is removed from the CV align display
and the UFCD displays the OPER option and operate frequency on the UFCD scratchpad. INS present
position is stored in waypoint zero if present position is valid. If NAV is not manually entered at
WoffW and a groundspeed of greater than 80 knots the INS automatically switches to NAV and stores
INS present position (if valid) in waypoint zero. Aircraft present position is entered as waypoint zero
if INS present position is invalid. Time to align is normally less than 10 minutes. D/L align frequency
is displayed on the UFCD scratchpad for 30 seconds after selecting CV align.
24.2.5.1.2 CV MAN (Manual) Alignment. A CV manual alignment is performed if the data link signal
is not available or not desired. CV manual alignment is initiated by entering CV data on the UFCD.
Manual carrier alignment takes approximately 15 minutes. To perform a CV manual alignment, the
parking brake must be set and the INS mode selector knob switched to CV. When this is done the INS
and data link are turned on and the CV align display appears on the MPCD. Selecting the MAN option
enables the manual align display on the MPCD and UFCD. MAN is boxed when selected and STD
HDG option is removed. The manual align display allows entry of carrier lat/long data, heading (CV
HDG), and speed (CV SPD). The INS uses this data to update present position during the alignment.
See figure 24-3.
During the alignment NO ATT is displayed on the CV align display until the INS platform is leveled
and a QUAL (quality) number is displayed. The AC (alignment counter) number on the INS
maintenance align 1 display on the DDI should also be monitored during alignment. INS align 1 display
is selected by pressing the BIT option on the SUPT menu and MAINT option on the BIT display. As
the alignment progresses the qual number on the align display decreases and the AC number on the
DDI increases. OK is displayed next to the QUAL number when a satisfactory alignment is achieved
　
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