January 2005 ADIRU 1 LNAV 11 VOR 23 ILS 24 CDS 25 MLS 26 GLS 27 MCP PUSHBUTTON 50 MCP C/O SW 52 MCP SPEED KNOB 54 MCP ALT SELECT 55 MCP V/S 56 MCP DISPLAYS 57 INTERLOCK 58 MCP CRS/HDG 59 ALT ALERT 61 DISENGAGE WARNING 62 ELEVATOR AILERON SPEED/STAB TRIM MACH TRIM FLAPS DUAL/STAB

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DFCS BITE PAGES - BITE LIBRARY

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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
LIBRARY
TEST NUMBER
30
31
32
33
34
35
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

DFCS BITE PAGES - FAULT ISOLATION TESTS
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 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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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 2005
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.

DFCS BITE PAGES - VERIFICATION TESTS
General
　
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