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level and true north by integrating the sensed angular
rates. The sensed accelerations are resolved into north,
east, and down components; corrected for coriolis : d
other factors; and integrated to provide velocity and
position information.
Figure 20-2. NAV MODE Select/Computer Reset Panel (Sheet 1 of 2)
ORIGINAL
NAVAIR 0%F14AAD-1
NOMENCLATURE FUNCTION
3
NAV MODE Selector NORM CV - Initiates alignment with or without ships Inertial navigation
system (SINS) data. Without SINS data, manual entry of the ships latitude,
longitude, true heading, and speed is required.
AUGN GND - Initiates alignment for shore based operations. Own alrcrafl
latitude and longitude required for inltlallzatlon.
INS - Selects INS navlgation.
IFA - Initiates inflight alignment (alrbome). Requires a valid source of true
heading from SAHRS or manual entry of best estimated true heading.
Al7 - Selects the IMU backup navigation mode. May require entry of alrcrafl
true heading at least one tlme, vla the DEU Own Alrcrafl format.
GB - Gyro Bias mode, not functlonal
TEST - Provides Built-In-Test for Installation and functional verlflcatlon (On
deck only).
OFF - Secures system function.
0 SYS RESET switch Resets translent fallures In the data processors and mlssion computers.
Figure 20-2. NAV MODE Select/ComputerR &et Pane( Sheet 2 of 2)
Outputs to the MCS include velocity, heading, attitude,
linear accelerations, angular rates, and time tagging
data. The SAHRS also generatess ynchro outputs
of roll and pitch for direct use by the AFCS, and magnetic
heading for the BDHI.
The SAHRS is controlled by MFD formats. During
concurrent alignment with the INS, the NAV MODE
select switch also controls the SAHRS. In ita normal
operating mode, the SAHRS is an inertial system with
velocity aiding selectable. It can also operate as a conventional
attitude heading reference system having
slaved, directional gyro, or emergency compass modes
available. The ‘WI-IRS receives magnetic heading from
the magnetic azimuth detector; provides compensation
for aircraft magnetic errors; and provides magnetic
heading to the BDHI using the best source available as
determined by the navigation system.
The SAHRS uses 115 Vat from the ac left main bus
through circuit breakers 113, 115, and 116. It may also
use 2%Vdc power corn the interrupt-free bus via circuit
breaker 9I3 if ac power is not available. Refer to Chapter
2 for the alphanumeric circuit breaker listing.
20.1.3 Mission Computer System. The navigation
system includes the navigation computations performed
by the MCS. The computations of inertial
parameters are performed respectively in the INS and
SAHRS processing modules that interface with the
MCS. The MCS processes this inertial data as well as
initial entered data and navigation aiding inputs. Processing
includes generating other navigation parameters,
filtering, time tagging, storing, and distributing data to
the displays and other system functions.
The MCS consists of two AN/AYK-14(XN-6) tactical
computers: MC1 and MC2. Normally MC2 performs
navigation system processing and computations.
Should MC2 fail, MC1 will perform virtually all navigation
system functions with the exception of data link,
JTIDS and radar position updates, JTIDS continuous
position update, JTIDS in-flight align, and surface waypoint
position determination.
ORIGINAL 204
The MCS is the data bus controller; it accepts INS
data and SAHRS data. It accepts navigation initialization
data from the DEU or the DD and subrnode selections
from the MFDs, providing this information to the
INS and SAHRS in the required formats. It also provides
JTIDS the INS or SAHRS data and accepts navigation
correction and tacan data from JTIDS. Inputs from the
various navigation aids are provided to the MCS via the
data bus after formatting in the CIU.
Based on crew mode selection, equipment availability
and input data received, the MCS determines the
mode of operation and the parameters to be computed.
It processesa nd storest hesev alues,u sing them for other
functions within the MCS as well as distributing them
to the displays and other aircraft functions.
20.1.4 Navigation Data Initialization. Initial
manual entry of required navigation information is accomplished
by the RIO. Either the DEU or the DD
control panel can be used.
20.1.4.1 Data Entry Unit. The DEU allows the
RIO to manually enter the initial navigation information
required for INS and SAHRS alignments and for waypoint
location. Such required data inputs include latitude,
　
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