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option boxed, dashed lines are displayed connecting the waypoints of that sequence. The dashed lines
connecting the waypoints (SEQ # boxed) are displayed for all HSI range scales and all HSI modes. The
dashed lines are removed when magnetic heading is invalid, aircraft position is invalid, or map slew is
selected.
24.1.3.13 AUTO Option (HSI Format). The AUTO option is located along the bottom of the HSI
display. Selecting the AUTO option provides auto sequential steering to the first waypoint in the
selected sequence; boxing the AUTO and WYPT or OAP option (if not already boxed). Selecting the
AUTO option while boxed deselects auto sequential steering and unboxes the AUTO option. The
AUTO option is removed when:
1. The INS is in an alignment mode
2. INS heading failure occurs
3. Magnetic is invalid
4. Aircraft present position is invalid
5. Aircraft ground track is invalid
6. Selected sequence contains less than two waypoints
7. Aircraft is in auto or velocity update
8. FCS is coupled to the D/L
9. A ground point is designated
24.1.3.14 TIMEUFC Option (HSI Format). The TIMEUFC option is located along the bottom row of
the HSI display. Selecting this option boxes TIMEUFC and initializes the UFCD option display
windows with the clock options: DATE, ET counter, CD timer, ZTOD, and LTOD. Border highlights
indicate that an option is enabled for data entry. If an option is displayed on the HUD, the option has
``*HUD'' displayed below it in addition to being border highlighted. The DATE, ET, ZTOD, LTOD,
and CD options are mutually exclusive; selecting one option deselects another option.
Data entry can be made for current date, current zulu or local time, or initial countdown time. No
data entry is available for the elapsed time option.
If DATE is highlighted, an ``M'', ``D'', and ``Y'' appear in the scratch pad and the month, day and
year can be entered on the keypad. If LTOD or ZTOD are highlighted two colons appear in the
scratchpad and the hour, minutes and seconds can be entered on the keypad. If CD is highlighted one
colon appears in the scratchpad and minutes and seconds can be entered. Leading zeroes must be
entered for the date and time entries. Digits not entered are assumed to be zeroes, i.e. trailing zeroes
need not be entered. The time is displayed on the scratchpad as it is entered and displayed as
``##:##:##''. When the time has been updated in the SDC it appears on the HUD and ``*HUD''
appears on the UFCD highlighted option. The time display can be changed from local or zulu by
selecting the appropriate option on the UFCD and entering the appropriate time as before.
A1-F18EA-NFM-000
VII-24-8 ORIGINAL
Countdown (CD) or elapsed (ET) time is selected and displayed in the same manner as local or zulu
time with the addition of START or STOP options. While CD START is displayed, the countdown
timer is counting down. The countdown timer defaults to 6 minutes on power up. If an invalid
countdown time is entered the timer sets to 59:59 and freezes. While ET START is displayed, the
elapsed timer is counting up to a maximum of 59:59.
24.1.3.15 MENU Option (HSI Format). When MENU is selected on the top level HSI display, the
TAC Menu is displayed. The Tactical (TAC) option provides access to weapons, sensors and HUD
formats. The TAC Menu is displayed when the MENU option on any format is pressed. The Support
(SUPT) menu is accessed by pressing the MENU option when the Tactical (TAC) menu is displayed.
When the SUPT menu is displayed, it provides access to the ADI, HSI, BIT, Checklists, Engines,
Flight Controls, UFC Backup and Fuel formats.
24.1.3.16 ACL Option (HSI Format). The ACL option is located on the left side of the HSI display.
When selected, ACL is boxed and the link 4 display appears on the left DDI.
24.1.3.17 SENSORS Option (HSI Format). Refer to A1-F18EA-TAC-100.
24.1.3.18 VEC Option (HSI Format). Refer to A1-F18EA-TAC-100.
24.1.3.19 D/L Option (HSI Format). Refer to A1-F18EA-TAC-100.
24.1.3.20 ILS Option (HSI Format). The ILS option is located on the left side of the HSI display.
When selected, ILS is boxed and ILS steering appears on the HUD.
24.1.3.21 TCN Option (HSI Format). The TCN option is located on the left side of the HSI display.
When selected, TCN is boxed and TACAN great circle steering appears on the HUD.
24.1.4 HSI Format on a DDI. The DDIs are capable of displaying HSI display and D/L information
by selecting the HSI or SA option on the applicable menu.
24.1.5 HUD - Navigation Information. The HUD displays basic flight symbology and steering
information for the TACAN, ILS, ACL, and INS.
24.1.6 Sensor Control Panel. This panel contains the INS mode selector knob, which controls INS
　
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