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Chapter 5 - Built-In Tests
5.1 BUILT-IN TESTS
A Built-in Test (BIT) checks the operational state for specific system components. BIT tests are executed by the
following system of operator initiated actions:
•
During system power-up
•
During system operation
•
Software initiated
Software initiated BITs will suspend operational use of the component until the test is complete. If a BIT test yields a
failure, a code error is registered as an alarm and classified into one of two categories:
•
Major
•
Minor
Major BIT Failures
Major failures indicate a capability loss. For example, a major failure of the EOW focus servo means that the sensor
can no longer focus. Depending on the degree of the major failure, the system component might still operate in a
degraded state. Operators are notified of Major BIT failures through pop-up alerts on the video overlay.
Minor BIT Failures
Minor failures indicate out-of-tolerance conditions. For example, a moving component has mechanical wear, and
the movement's timing takes longer than the stored design time. Operators are notified of Minor BIT failures through
pop-up alerts on the video overlay.
5.1.1
Software BIT Status
User menus provide BIT status text that operators can review to confirm the operational capability of some major
component. The System Status main menu provides a top level, lookup reference for the main turret and payload
components. Each component's second level user menu will provide the same status message and an alarms
indicator.
Figure 5-1 Example of a Major BIT Failure in the System Status Menu
October 2007
86
LEVEL 1 - SYSTEM STATUS
GIMBAL
EOW
IR
EON
RANGE FINDER
OK
OPERATIONAL
OK
OPERATIONAL
MAJOR OPERATIONAL
OK
OPERATIONAL
OK
OPERATIONAL
TM00358 Rev. A
L-3 WESCAM
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