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pilot ejection.
2.18.1.2.6 Manual Erase. Manual erase is a two pushbutton process and is initiated by pressing the
ERASE pushbutton on the MUMI display. When the ERASE pushbutton is pressed, the option to
proceed with the erasure (ERASE) and the option to cancel the erase (CNX) replaces the HOLD and
ERASE options. Selecting the second ERASE option initiates erasure. While erase is in progress,
ERASE is boxed and erasing proceeds the same as automatic erase. When erasing is complete, the
ERASE pushbutton unboxes. While erase is in progress one of the following is displayed on the MUMI
display:
1. ERASING - erasing of unit is in progress.
2. COMPLETE - erasing of unit is complete.
3. FAILED - unit failed to erase.
When erase fails, the MC 1 retains the MUMI ERASE and HOLD pushbutton options and displays
the ERASE FAIL caution on the DDI. When erasing is complete, MC 1 removes the ERASE, HOLD,
and MC SUSPEND pushbutton options from the MUMI display, removes the CDATA advisory from
the display, and resets the applicable maintenance code(s).
2.18.1.2.7 Backup Erase Controller. If MC1 fails, backup erase capability is provided by MC2 by
providing an ERASE option on the HSI format. When the ERASE pushbutton is depressed, the option
A1-F18EA-NFM-000
I-2-129 ORIGINAL
to proceed with the erasure (ERASE) and the option to cancel the erasure (CNX) are provided.
Selecting the second ERASE option initiates erasure. While ERASE is in progress, the ERASE option
is boxed; however, additional cuing is not provided. In backup mode, pilot ejection is the only
automatic erase provided.
2.18.2 Master Modes. There are three master modes of operation: navigation (NAV), air-to-air
(A/A), and air-to-ground (A/G). Controls, displays, and the avionics equipment operation are tailored
as a function of the master mode selected. The navigation master mode is entered automatically when
power is applied to the aircraft, when the air-to-air or air-to-ground modes are deselected, when the
landing gear is lowered, when the SPIN mode activates, or when the aircraft has WonW and the THA
is greater than 27°. The A/A master mode is entered either by pressing the A/A master mode button
alongside the left DDI or by selecting an A/A weapon with the A/A weapon select switch on the control
stick. The A/G master mode is selected by pressing the A/G master mode button. The selection is
performed by the stores management set (SMS), and the SMS identifies the selected master mode to
the mission computer.
2.18.2.1 Steering Information. The sources of steering information available in the NAV master
mode are waypoint, TACAN, instrument landing system, and data link. The data link modes available
in the NAV master mode are vector and automatic carrier landing. TACAN and waypoint steering are
mutually exclusive; selecting one automatically deselects the other. Data link, ILS, and TACAN (or
waypoint) steering can be provided simultaneously. The ACL mode is selectable only in the NAV
master mode and the vector mode is available in all master modes. Steering information is used by the
Automatic Flight Control System to provide coupled steering options.
2.18.3 Cockpit Controls and Displays. The cockpit controls and displays which are used for
navigation operation are on the multipurpose display group.
2.18.4 Multipurpose Display Group. The multipurpose display group consists of the right and left
digital display indicators (DDI), the multipurpose color display (MPCD), the digital map set (DMS),
the head-up display (HUD), the CRS (course) set switch, the up front control display (UFCD) and the
HDG/TK (heading/ground track) set switch. The multipurpose display group presents navigation,
attack, and aircraft attitude displays to the pilot. The multipurpose display group converts information
received from the mission computer system to symbology for display on the right and left DDI, the
MPCD, the UFCD, and the HUD. The HUD camera records the outside world and HUD symbology.
The left and right DDIs and the MPCD contain pushbuttons for display selection and selection of
various equipment operating modes. The UFCD is an active matrix liquid crystal display with an
infrared (IR) touchscreen for operator inputs. Refer to Part VII for the operation of each component.
2.18.4.1 CRS Set Switch. The course set switch located on the main instrument panel on the video
record panel, manually sets the desired course on the HSI display.
2.18.4.2 HDG/TK Set Switch. The heading /ground track set switch located on the main instrument
panel on the video record panel, manually sets the heading marker on the desired heading/ground track
on the HSI display.
2.18.4.3 DDI - Digital Display Indicators. The left and right DDI (LDDI/RDDI) are physically and
　
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