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4. Reselectingt he ALL and TEST pushbuttonsw hile
the timctional group test is in progress will terminate
test for equipment in test. Equipment that
cannot be terminated will continue in test until
normal completion. When all equipment has completed
test, the TEST pushbutton legend is unboxed
to indicate that testing is complete.
38-27 ORIGINAL
NAVAIR Ol-Fl4AAD-I
Unit tests are initiated from any OBC functional
group format by pressing equipment and TEST pushbuttons.
Any number of equipment pushbuttons may
be pressed prior to pressing the TEST pushbutton in
order to test more than one item at the same time. For
each selection, the pushbutton legend is boxed to indicate
selection and unboxed when deselected. Only
equipment with a boxed legend will be tested. Depending
on flight status, all equipment that satisfies
individual interlock conditions will be initiated into
test. Refer to Figure 38-7 for individual test selects.
1. If interlock conditions/restrictions are not satistied
for at least one equipment, testing will not
be initiated.
2. If interlock conditions are satisfied for at least
one equipment, the TEST pushbutton legend is
boxed on the applicable OBC functional group
format to indicate a valid test selection and BIT
is initiated for ail equipment that is powered on
and ready.
3. Nominal test times may vary as a Iunction of the
selected equipment initiated to test (refer to Figure
384).
4. Reselecting equipment and TEST pushbuttons
while test is in progress will terminate test for
equipment still in test, Equipment that cannot be
terminated will continue in test until normal completion.
When all tests are complete, the TEST
pushbutton legend is unboxed to indicate that testing
is no longer in progress.
38.3.3.2.3 OBC Display Messages. OBC display
messages are shown on the MFDs in response to invalid
test selections resulting from interlocks not being
satisfied, interlocks changing, and for tests
completed.
Normally, OBC computer messages are displayed
on the pilot center MFD and the RIO MFD. If the pilot
center MFD is powered off or failed, computer messages
will be displayed on the pilot right MFD. These
messages are removed ftom the display head by pressing
the ACK pushbutton, which is boxed to indicate
that at least one display message requires acknowledgment
(refer to Figure 38-12).
OBC/CSS messages are displayed on the MFD
from which the test selection is made and also displayed
on the same MFD if a CSS format is presented.
There are two types of messages within this class:
3-second type, displayed for 3 seconds and then removed
by the system; conditionally removed type,
displayed until either the applicable interlock condition
is satisfied, or until the format is changed (refer
to Figure 38-13).
38.3.3.2.4 OBC-Related Warning/Caution/
Advisory Messages. Figure 38-14 shows acronyms
that are displayed on MFD3 in responset o equipment
failures or overheating.
38.3.3.2.5 Failure History File Format. The FHF
format displays a history of WRA thihuea. There is a
maximum of 10 entries per WRA for which the WRA
failure statusa nd the time of failure are.d isplayed. The
time of failure is relative to the last time the system was
cold started or SYSTEM RESET was pressed The FBF
is cleared when the CLR pushbutton is pressed with
preflight conditions satisfied. The preflight conditions
are: weight on wheels, TAS < 76 knots, pilot’s OBC
discrete via the MASTER TEST panel, and handbrake
set.
38.3.4 Joint Tactical information Distribution
System On-Board Check. JTIDS OBC can be selected
whenever electrical power and cooling air are
available. The JTIDS secured. ata unit needst o be installed
and loaded for JTlDS to pass OBC. Without the
unit installed and loaded, JTIDS OBC will display a
DDP fail. A JTIDS download is not required for JTIDS
OBC; however, if the DSS is loaded, a download is
recommended. The selection of JTlDS OBC when not
in sync (receiving messages) will pass but the fail data
will have bit 4 in word 11 and bit 8 in word 12 because
no messagesa re received
The selection of JTIDS OBC will interrupt tacan
data (momentary display of tacan fail detected computer
message) and initiate a tacan self-test. This will
disable tacan steering and tacan navigation updates, if
selected, range will go invalid, bearing will display
270”; then range will display 000 miles and bearing
180’.
ORIGINAL 38-28
NAVAIR 01.Fl4AAD-1
COMPUTER MESSAGE DESCRIPTION
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