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3.
24.2.8.3 Zulu Time of Day (ZTOD). The FIRAMS Real Time Clock (RTC) is used to keep ZTOD.
The only time ZTOD needs to be set is if the FIRAMS RTC failed power up BIT. In this case the MC
internal counter would be used and requires the MC internal clock to be set. ZTOD is displayed on the
HUD and HSI display and is needed to calculate MC required groundspeed and TOT.
Enter ZTOD by selecting the TIMEUFC option on the HSI top level display to initialize the UFCD
for ZTOD programming. Then select the ZTOD option on the UFCD, enter ZTOD on the UFCD
keypad, and select the ENT option. At first selection of ZTOD, it is displayed on the HUD and HSI
display. ZTOD is displayed on the lower left corner of the HUD and HSI display. If time is displayed
on the HUD, the respective option has ²*HUD² displayed below it. ZTOD is not displayed on the HUD
when either the ET or CD is selected for display. See figure 24-8, sheet 4.
24.2.8.4 Elapsed Time (ET). ET starts incrementing in minutes and seconds from 00:00 to 59:59.
When 59:59 is reached ET resets and begins incrementing again from 00:00. ET is displayed on the
lower left corner of the HUD and on the lower right corner of the HSI display. ET is not displayed on
the HUD or HSI display when either ZTOD, LTOD or CD is selected.
Activate ET by selecting the TIMEUFC option on the HSI top level display initializes the UFCD for
ET selection. Selecting the ET option on the UFCD displays ET 00:00 on the HUD and HSI display.
See figure 24-8, sheet 4.
24.2.8.5 Countdown Time (CD). CD starts decrementing in minutes and seconds from a default
value of 06:00. When 00:00 is reached, the CD timer is removed from the HUD and HSI displays. CD
is displayed on the lower left corner of the HUD and on the lower right corner of the MPCD. CD is not
displayed on the HUD or HSI when either ZTOD, LTOD or ET selected. The CD timer initializes to
the default value at power up with WonW.
Activate CD by selecting the TIMEUFC option on the MPCD top level display to initialize the
UFCD for CD selection. Selecting the CD option on the UFCD displays CD 06:00 on the HUD and HSI
display. See figure 24-8, sheet 4.
The CD default value can also be reset by entering in a value between 00:00 and 59:59 by selecting
the TIMEUFC option on the HSI top level display to initialize the UFCD for CD programming,
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VII-24-31 ORIGINAL
entering in the reset value through the UFCD keypad, and pressing the ENT option. The reset value
must be less than or equal to 59:59 so that when the ENT option is pressed the CD timer begins to
decrement. If the reset value is greater than 59:59, selection of the ENT option sets the reset value to
59:59 and freezes the CD timer.
24.2.8.6 Local Time Of Day Programming (LTOD). LTOD is displayed on the HUD and HSI
display. Set LTOD by selecting the TIMEUFC option on the MPCD top level display initializes the
UFCD for LTOD programming. Selecting the LTOD option on the UFCD, entering LTOD on the
UFCD keypad, and selecting the ENT option. The LTOD option is displayed if the FIRAMS passes
power up BIT. See figure 24-8, sheet 4.
24.2.8.7 Date (DATE). Set the date by selecting the TIMEUFC option on the MPCD top level display
initializes the UFCD for date programming. Selecting the DATE option on the UFCD allows ``M'', ``D''
and ``Y'' to appear on the scratchpad. Enter the date on the UFCD keypad, and select the ENT option.
The date must be entered as two digit values in the following order: month, day and year. See figure
24-8.
24.2.8.8 Time Zone. The time zone is set by first entering ZTOD followed by LTOD. The MC uses
the difference between these values as the current time zone. Any future changes to ZTOD
automatically change LTOD based on the current time zone. Any future changes to LTOD reset the
time zone.
24.2.9 Position Keeping. Selection of the POS/XXX option on the MPCD top display provides the
position keeping option display, see figure 24-9. This display allows in flight selection of POS/AINS,
POS/ADC, POS/GPS, or POS/TCN as the position keeping source. Selecting one of these options
returns the MPCD top level display with the appropriate position keeping source selected. INS
position keeping is automatically selected during ground operations when INS data is valid. Should the
INS fail, the mission computer automatically begins FCC air data position keeping from the last valid
INS position; however, it is unreliable.
AINS and GPS position keeping are not available unless good GPS data is available. GPS data is
good when the GPS vertical error (GPS VERR) and GPS estimated horizontal error (GPS HERR), as
shown on the aircraft data format, are each less than 100 feet. AINS position keeping is selected by
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NATOPS Flight Manual 飞行手册 2(101)
