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2.21.3.7 AUTO BIT. If the AUTO button is pressed, BIT are initiated in parallel for all equipment
turned ON and whose interlocks are satisfied. The test pattern associated with the DDI and HUD is
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not displayed when the AUTO option is used. Approximately 2½ minutes are required for all AUTO
BIT except FCS and INS.
1. Check power applied to all systems requiring BIT and check required interlocks in safe condition.
2. Select MENU/BIT/AUTO on DDI.
a. All systems read GO after required test period. GO indication is provided when system check
is complete and OK. Other messages may be displayed if malfunctions are detected.
3. If FCS test required, perform FCS Initiated BIT above while substituting the AUTO button for
the FCS button in the procedure. Insure the procedural warnings and notes are observed and that
the AUTO button and FCS BIT consent switch are held simultaneously to initiate test.
4. If INS test required, perform INS initiated BIT above while substituting the AUTO button for
the INS button in the INS Initiated BIT procedure.
2.21.3.8 Cockpit Displays Initiated BIT.
2.21.3.8.1 DDI/HUD Initiated BIT. Operator participation is required to detect failures and isolate
faults in the display equipment. The BIT/DISPLAYS/DDI-HUD option starts the MC generated test
patterns on the DDI and HUD immediately after each indicator BIT is concluded. The test pattern can
be compared on the three displays for similarity and individually for concentricity, intensity level, and
alphanumeric clarity. Options are tested by actuating all the buttons. A circle appears adjacent to the
button when the functional test is successfully completed.
Pressing DDI-HUD initiates BIT on two different equipment display groups. The following
procedure can be used to test one or both of the display groups by performing the appropriate parts
of the procedure.
1. Select BIT/DISPLAYS/DDI-HUD
a. DDI and HUD displays go blank momentarily, flash IN TEST, and display a test pattern.
b. Check DDI test patterns are steady and in focus. See figure 2-54.
c. HUD test pattern flickers but remains on.
2. DDI and HUD displays - CHECK
a. Display commonality
b. Display concentricity
c. Proper intensity
d. Check right DDI pushbuttons (20) starting with the top left button on the horizontal row.
Circle is displayed next to each pushbutton after it is pressed.
e. Check BIT status messages for GO on the BIT displays. F/A-18F lists front and rear indicator
results separately.
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Figure 2-54. MPCD and UFCD Test Patterns
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2.21.3.8.2 EFD Initiated BIT. The EFD test pattern is initiated by performing EFD BIT using
pushbutton sequence BIT/DISPLAYS/EFD and observing the test pattern display following the
completion of EFD BIT. The EFD test pattern may be observed using the following procedure.
1. Select BIT/DISPLAYS/EFD
2. EFD - observe test display
3. Select STOP or MENU to terminate test pattern
While the test pattern is displayed, selecting the MODE button or pulling the BINGO knob toggles
between the two test patterns displayed in figure 2-55. Rotating the BRT knob does not change display
intensity. Rotating the BINGO knob increments or decrements the number displayed in the lower
right corner from 1 to 12, depending on the rotation direction (clockwise or counterclockwise).
2.21.3.8.3 MPCD Initiated BIT. The MPCD receives information directly from the MC for display
and also processes the information provided for display on the UFCD. The MPCD test pattern is
initiated by doing MPCD BIT using pushbutton sequence BIT/DISPLAYS/MPCD and observing the
test pattern display following the completion of MPCD BIT. The MPCD test pattern may be observed
using the following procedure.
1. Select BIT/DISPLAYS/MPCD
2. MPCD and UFCD - observe test displays
3. Select STOP or MENU to terminate test pattern
The BIT format can be displayed on the MPCD or UFCD during DDI/HUD BIT and on the DDI
during MPCD BIT. On F/A-18F, the MPCD option initiates BIT on both the cockpit and rear cockpit
MPCD. During MPCD BIT the message MPCD IN TEST is displayed on both the MPCD and UFCD.
When IBIT is completed, the test pattern (figure 2-54) is displayed on both the MPCD and UFCD.
2.21.3.8.4 UFCD Initiated BIT. UFCD test patterns are initiated by selecting BIT/DISPLAYS/
UFCD and observing the test pattern display following the completion of UFCD BIT. The UFCD test
pattern (figure 2-56) is obtained using the following procedure.
Figure 2-55. EFD Test Pattern
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1. Select BIT/DISPLAYS/UFCD
2. UFCD - Observe test display
　
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