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-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 MCDU. 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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January 1, 2004
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
CURRENT STATUS
CHAN A/BAUTOTEST GP 10
FAULT ISOLATION

(INTERACTIVE AND SURFACE TESTS)

LAST 40 LEGS

BY FAULTS FROM LAST 40 LEGS

ALL LIBRARY TESTS
SELECTED LIBRARY TEST
SKIPPED LIBRARY TESTS

FAULT HISTORY BY FLIGHT LEG GP 20
FAULT HISTORY BY FLIGHT DECK EFFECT GP 20

A22-11-00-111.fm
DFCS BITE PAGES - FAULT ISOLATION TESTS

January 1, 2004
22-11
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
DFCS BITE PAGES - VERIFICATION TESTS
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 is complete, you can do the interactive test. There are no surface tests. The graphic shows a list of the systems that have an LRU replacement test.
　
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