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Interactive
Tests in this category need inputs from the BITE operator. They
may need the operator to push a button or move a switch. The
instruction shows on the CDU. These tests do not need
hydraulic power. You can run these tests even if the autotests
do not pass.
Surface
Tests in this category need hydraulic power. The tests may also
need the operator to do specific tasks.
If the group test consists of tests in all three categories, the
autotest occurs first, the interactive test occurs next and then
the surface test.
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General
You use BITE fault isolation tests with the FIM to find out what is
wrong with the DFCS for troubleshooting the failures that the
crew writes in their log. These are the DFCS BITE fault isolation
tests:
* Current status (group 10)
* Fault history by flight leg (group 20)
* Fault history by flight deck effect (group 20)
* BITE library (group 60).
Current Status
These are the current status tests:
* Autotests of line repairable units (LRU)s
* Autopilot function interactive and surface tests (group 11)
* Flight director function interactive and surface tests (group
12)
* Mach trim function surface tests (group 13)
* Speed trim function interactive and surface tests (group 14)
* Altitude alert function interactive tests (group 15).
The current status tests let you quickly find the condition of the
DFCS. It first runs a series of autotests without the need for
inputs from the operator. The tests find steady state failures
down to the LRU. You then choose one of the function tests,
such as autopilot or flight director. These tests consist of
interactive and surface tests.
You need to make inputs for the interactive tests. There are
instructions on the CDU. After you do the interactive tests, you
can do a surface test.
The surface tests needs hydraulic power to operate the control
surfaces. When the surface test is complete, the current status
is complete for that function.
Fault History by Flight Leg
The maintenance monitor (MM) stores records of inflight
failures for the last 40 flights in non-volatile memory. The
BITE shows how many failures occured and what they were
during each flight legs.
Fault History by Flight Deck Effect
The BITE also groups all of the failures during the last 40 flights
by type of fault. The type of fault is a result of the effect it caused
in the flight deck. An example of a flight deck effect is A/P DISC,
autopilot disengaged.
BITE Library
You can do all of the library tests or you can select the tests that
you want to do.
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General
After you replace an LRU, you use the verification test to make
sure it is valid. You use the verification tests to do a check of the
control surface rigging. You also use the verification tests to
measure the value of the sensors. These are the DFCS BITE
verification tests:
* LRU replacement tests (group 30)
* Land verify test (group 49)
* MCP tests (group 70)
* Rigging tests (group 50)
* Sensor values.
LRU Replacement Tests
You use these tests to make sure that an LRU that you replaced
is good. The test looks at the interface between the FCC and the
LRU. All of the tests have an autotest part first. After the autotest
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