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displayable as NO GO as a result of a
subsystem not completing
commanded BIT within a set time.
NAVAIR 01.FQIAAD-1
38.3.1.3 MFD Commanded BIT. In addition to
displaying equipment BIT status, the MFD OBC formats
are the primary means for generating commandinitiated
BIT. Testing can be controlled from any MFD
on which an OBC format is displayed. The only other
available method of testing (for equipment listed in Figure
38-4) is to use a dedicated cockpit panel to control
test on an individual equipment basis. Test controls allow
tests of the selected subsystem(s) to be initiated or
terminated. The OBC display formats allow testing at
several different levels, including sequence testing,
functional group testing, and individual (or unit) testing.
Sequencete stinga llows severali tems to be testeda t the
same time, with the MCS automatically testing (i.e., in
parallel or in sequence) the appropriate equipment.
Functional group testing allows functionally related
equipment to be tested at the same time in a similar
manner to the sequencete sts.E ach OBC format generally
contains a series ofpushbutton legends representing
systems that have command-initiated BIT capability.
CommandedBIT canbe initiated one at a time, or in any
combination, as long as the prerequisites for testing are
satisfied. Refer to paragraph 38.32 for commanded BIT
test prerequisites.
OBC display formats also serve to provide feedback
or the progress of testing (i.e., in test, test complete, and
awaiting test) through MFD acronym status. Computer
messagesa re generateda nd displayed on the MFDs in
responseto invalid test selections.
38.3.1.4 Control Panel-lnltiated BIT. Control panelinitiatedB
IT is an alternatem ode of BIT initiatedt iom a
cockpit control panel. Refer to Figure 38-4 for applicability,
Control panel initiated BIT is described with the
applicable subsystem.
38.3.2 Test Prerequisites/Restrictions. Commanded
BIT testing requires that certain conditions be
satisfied prior to the test command from the MCS, for
safety-of-flight purposes. These conditions govern the
control of all commanded BIT initiated through the
MFDs and depend on the type of test. In addition, there
are somer estrictionst hat disablet estsb ecauseo f equipment
or operational mode conflicts. (Initial and continuous
BIT are not subject to these conditions.)
38.3.2.1 BIT Interlocks/Test Restrictions. Preflight
tests are enabled by the pilot selecting OBC on
the MASTER TEST panel with weight on wheels,
TAS < 76 knots, and handbrake set. These tests are
designated preflight and it is recommended that they
be performed at this time since a failure may cons&
tute a flight safety hazard. All interlocks are constantly
checked for change in status to ensure the
safety of the aircraft. In-flight tests are performed only
38-9 ORIGINAL
Figure 38-6. Status Types
NAVAIR 0%Fl4AAD-1
whenthe aircraft is airborne with weight off wheels and
TAS > 76 knots. Refer to Figure 38-7.
38.3.3 Avionic BIT Operation. Avionic BIT operation
is controlled through MFD OBC display formats.
For some systems, dedicated control panels serve as a
redundant and alternate means for controlling BIT. All
OBC formats display equipment status, equipment failure
acronyms for detected WRA failures, and the progress
of testing. These formats provide the capability to
manually initiate/terminate command BIT and to
mask/unmask current failures on the displays. These
formats are accessible on any MFD including the pilot
center (MFDl), pilot right (MFD2), and RIO (MFD3)
displays.
When the system is powered up from a cold-start
condition (i.e., power to MCS off for greater than 300
milliseconds) or when system reset is ordered, the mission
computers perform initial BIT. All other equipment
takesvaryingamountsoftimetowarmuportocomplete
initial BIT. At the completion of mission computer initial
BIT, MFD2 will display the OBC BASIC format.
At all other times, the OBC BASIC format can be accessed
on any MFD by selecting the MENU1 pushbutton
followed by the OBC pushbutton. The OBC BASIC
formaJ allows initiation of various test sequencesa, nd
also serves as the menu for access to all other OBC
formats. Tests can also be commanded through OBC
functional group formats. OBC computerm essagesp rovide
feedback to the flightcrew and are displayed when
testing is completedo r in responseto tests electionst hat
are not acceptableb ecauseo f invalid interlocks and operational
conflicts.
When the system is in a backup mode of operation
　
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