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corner of the HSI, however, only one of the timers can be displayed at a time. ET or CD timer must
be selected to be displayed. ET initializes to zero minutes and seconds and CD time initializes to six
minutes and zero seconds.
13. Aircraft heading. Aircraft heading is indicated on the compass rose. Aircraft heading and bearing
data can be selected as either magnetic or true. With true heading selected, the letter T appears
below the lubber line and the word TRUE appears below the selected scale readout. There is no
indication when magnetic heading is selected.
2.18.4.6 HUD - Head-Up Display. The HUD is on the center main instrument panel. The HUD is
used as the primary flight instrument, weapon status, and weapon delivery display for the aircraft
under all conditions. The HUD receives attack, navigation, situation, and steering control information
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from the left or right DDI symbol generators (under mission computer control) and projects symbology
on the combining glass for head-up viewing. The HUD is electrically interfaced with the UFCD. The
HUD has NVG compatible raster display capability to allow it to display NFLR video. The controls for
the HUD are below the UFCD and are described in the following paragraphs. See figure 2-44.
2.18.4.6.1 HUD Symbology Reject Switch. The HUD reject switch is located on the HUD control
panel on the center main instrument panel. This switch is used to control the amount of symbology
displayed on the HUD.
NORM Displays full HUD symbology.
REJ 1 Removes the Mach, g, and peak-g indications, the bank angle scale and pointer, the airspeed
and altitude boxes, energy caret (landing gear down), and the ground speed
required cue.
REJ 2 Removes REJ 1 symbology and the heading scale, current heading caret, command
heading marker, NAV/TCN range, and the ET, CD, LTOD or ZTOD timer.
2.18.4.6.2 HUD Symbology BRT Control Knob. This knob is used to turn on the HUD and then
varies the display intensity.
2.18.4.6.3 HUD Symbology Brightness Selector Switch. This is a two-position toggle switch with
positions of DAY and NIGHT. Placing the switch to DAY provides maximum symbol brightness in
conjunction with the HUD symbology brightness control. With the switch set to NIGHT, a reduced
symbol brightness is provided in conjunction with the HUD symbology brightness control.
2.18.4.6.4 Black Level Control Knob. The black level control knob, located on the HUD control
panel, adjusts the NFLR video plus or minus ½ a shade of gray per increment when rotated.
2.18.4.6.5 HUD Video Control Switch. The video control switch, located on the HUD control panel,
enables NFLR video display on the HUD with selectable polarity (white hot/black hot).
W/B Selects white hot/black hot polarity.
VID Displays NFLR video in the HUD, if available.
OFF NFLR video off.
Figure 2-44. HUD Controls
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2.18.4.6.6 BAL Control Knob. The balance control, located on the HUD control panel, adjusts the
stroke brightness relative to the raster brightness. Rotating the switch from 12 o'clock towards the VID
position holds the brightness of the video (as set by the brightness control switch) and reduces the
brightness of the stroke symbology. The opposite is true when rotating the switch toward the SYM
position.
2.18.4.6.7 AOA Indexer Control Knob. This knob controls the brightness of the indexer lights.
2.18.4.6.8 ALT Selector Switch. The ALT selector switch, located on the HUD control panel, is used
to select the primary altitude source for display on the HUD and for use in the mission computer
(weapon systems calculations).
BARO Selects barometric altitude.
RDR Selects radar altitude.
2.18.4.6.9 ATT Selector Switch. The ATT selector switch, located on the HUD control panel, is used
to select the primary attitude source used for display in the HUD and in MC and FCC computations.
INS Functions identically to the AUTO position.
AUTO Selects filtered INS data as the primary attitude source. The INS automatically reverts
to gyro mode, using unfiltered data if its processor fails. The MC automatically selects
the standby attitude reference indicator for attitude information if the INS fails completely.
STBY Selects the standby attitude reference indicator. The FCCs no longer use INS data and
the HIAOA advisory is displayed.
The FCCs no longer use INS data and the HIAOA advisory is displayed.
2.18.4.6.10 HUD Symbology. The following paragraphs describe HUD symbology as related to basic
navigation, steering (direct, great circle, courseline, and ILS), navigation target designation, advisories
and landing, see figure 2-45. Refer to part VII for a description of how these symbols are integrated into
　
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