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.
Land Verify Test
This is a test to do a check of as many autoland sensors and hardware as possible. This test also looks at the systems that the crew can use in a dual channel operation.
MCP Tests
This test does a check of the interface between the MCP and the FCC. It also does a check of the operation of the MCP switches and displays.
737-700 MAINTENANCE TRAINING MANUAL
Rigging Tests
These tests let you read sensor data without the use of extra test equipment. The rigging tests verify the correct alignment of these components:
-Control surfaces
-Autopilot actuators
-Position sensors.
You can do rigging tests of the components for these functions:
-Elevator (group 51)
-Aileron (group 52)
-Flaps (group 53)
-Stabilizer (group 54)
-CWS (group 55)
-Mach trim (group 57).
Sensor Values
BITE allows you to see the analog position sensor values. You can measure some discrete signals and read some digital data words. You can also do a check of the option program pins.
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737-700 MAINTENANCE TRAINING MANUAL
ALL MCP LIBRARY TESTS
MACH TRIM GP 57
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ANALOG SIGNALS
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DIGITAL SIGNALS
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SELECTED OPTION PINS
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DISCRETE OUTPUTS
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DISCRETE INPUTS
AILERON GP 52
STABILIZER GP 54
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DFCS BITE PAGES - VERIFICATION TESTS
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DFCS BITE PAGES - FCC BITE ENTRY FAILURE
General
To select the DFCS BITE test, push LSK 2L of the MAINT BITE INDEX page. When you push this key, FCC A and FCC B tries to go into the BITE mode. One FCC, usually FCC A becomes the master FCC and the other FCC becomes the slave FCC. If one FCC or both FCCs cannot get into BITE, a failure displays shows on the MCDU.
Master FCC Cannot Enter BITE
If the master FCC cannot enter BITE, the lower left BITE page shows on the MCDU. One of these messages shows on the MCDU to tell the operator why it could not enter BITE:
-A/P-A ENGAGED (J4A-55)
-A/P-B ENGAGED (J2A-17)
-CAS ABOVE 60 KNOTS AND GND SPEED ABOVE 40 KNOTS
FROM ADIRU#1/2
-AIR/GND SW INDICATES AIR MODE (J1A-42)
-NO FMC BITE REQUEST.
Pull the circuit breaker for the master FCC and push the INIT REF key on the MCDU to try the test again.
Master FCC Enters BITE, But Non-Master Does Not
If the master FCC goes into BITE and the non-master FCC does not, the lower center BITE page shows on the MCDU. One of these messages also shows on the MCDU:
-CHANNEL B NOT POWERED OR CROSS CHANNEL BUSES
FAIL
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