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CSC if it is not. For non-MUX CNI equipment, the CSC converts the commands to analog or discrete
information and directly interfaces with the equipment. The CSC also converts standby attitude
signals used in the Electronic Attitude Display Indicator (EADI) and if the CSC fails the EADI is not
available.
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CHAPTER 24
Navigation Equipment
Navigation equipment consists of the following: Inertial Navigation System (INS, AN/ASN-139),
Global Positioning System (GPS AN/ASN-163), TACAN (RT 1159A/ARN-118), Instrument Carrier
Landing System (ICLS, AN/ARA-63), Data Link (D/L, RT/1379A/ASW), and Automatic Direction
Finder (ADF, OA-8697/ADR).
24.1 NAVIGATION CONTROLS AND INDICATORS
Navigation controls and indicators consist of the UFCD, MPCD, DDIs, HUD, INS mode switch,
course set switch, and COMM control panel. These controls and indicators are integrated in the
navigation system. MPCD and HUD symbology, and UFCD functions are described in Chapter 2.
24.1.1 UFCD Navigation Controls. The UFCD allows: ON/OFF operation of the ILS, TACAN, D/L,
and ADF; data entry for the TACAN and INS; and mode selection for the D/L.
24.1.2 Moving Map - Digital Map Set (DMS). The DMS utilizes the MPCD to provide the pilot/WSO
with a high resolution color map display for day/night navigation. The DMS display can be selected on
the front or rear MPCD or any DDI; however, a DDI will only display a monochrome image.
24.1.2.1 MAP Option (HSI Option). The MAP option provides On/Off control of the DMS map when
selected from an MPCD (MAP option is boxed when the map is ON). When MAP is selected from a
DDI, the HSI format source alternates between stroke (DDI symbol generator) and raster (DMS
mono-map) on all DDIs displaying the HSI format. The DMS map is commanded ON for any DDI and
both MPCDs when the raster HSI is selected on a DDI.
When map update is selected from the front cockpit MPCD, the TDC is assigned to the map slew
function. When map update is selected from the rear cockpit MPCD, the LDC is assigned to the map
slew function (if the LDDI is not communicating on the AVMUX, the RDC is assigned). When map
update is selected from the right or left DDI, the RDC or LDC, respectively, is assigned to the map slew
function. When map update is selected, MAP is automatically boxed. When map update is selected on
a DDI, all DDIs displaying the HSI format are driven by the DMS mono-map.
24.1.2.1.1 Moving Map Range Scales. For HSI in T UP (Track Up) or N UP (True North Up), valid
range scale/map type combinations are as follows: 40/1:2M, 20/1:2M-ZOOM, 10/1:500K, 5/1:250K.
For HSI in DCTR (Decenter), valid range scale/map type combinations are as follows: 80/1:2M,
40/1:2M-ZOOM, 20/1:500K, 10/1:250K.
Map compatible range scales are:
1. Centered (5, 10, 20, & 40 nm)
2. Decentered (10, 20, 40, & 80 nm)
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24.1.3 HSI Format. The MPCD displays TACAN, INS (also INS alignment data), D/L, ILS, and
ADF navigation symbology. The MPCD also allows selection of various TACAN, ILS, INS, and D/L
functions using the MPCD option pushbuttons. See figure 24-1.
The HSI format displayed on the MPCD is driven by the MPCD symbology overlaying the DMS
color map. The HSI format displayed on the DDI is driven by either a mono-map output from the DMS
or a DDI symbol generator. The DMS mono-map output contains the same information as the DMS
color output except for color, including cautions if they are provided with the color output. If the DMS
fails, the color map is unavailable; however, all stroke formats are available for display.
Navigation symbols and digital readouts are normally displayed on the MPCD. One of three TDC
assignment symbols can be displayed in the upper right corner of a TDC compatible display, to
indicate a TDC is assigned to the display in the front cockpit only, rear cockpit only, or both cockpits.
When a TDC is assigned to the map slew function, SLEW is displayed in the upper right corner of the
HSI display along with one of three arrows to indicate TDC assignment to the display in the front
cockpit only, rear cockpit only, or both cockpits.
24.1.3.1 HSI Option. This option returns the operator to the Top Level HSI format after the DMS
has been configured for operation. The HSI option coincides with the other HSI options found on
similar HSI formats to ensure consistency between formats. See figure 24-2.
24.1.3.2 MODE Option (HSI Format). The HSI display MODE option is located adjacent to the
center left push button of the DDI or MPCD. Selecting the MODE option enables T UP (Track-up),
N UP (true north up), DCTR (decenter), MAP, and slew options to be displayed on the left side of the
　
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