January 1, 2004 - 10 -
-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.
-FCC-A(B) TO MCP BUS FAILURE.
Neither FCC Can Send BITE Messages to the FMC
If neither FCC can send the BITE messages to the FMC, the lower right BITE page shows on the MCDU. The DFCS BITE does not operate and the maintenance person needs to check the FCCs or the interface between the FCCs and the FMC.
Rockwell Collins Enhanced Digital Flight Control System Differences
The Collins Enhanced Digital Flight Control System has the capability to crossload between the two FCC’s. Crossload takes approximately 6-8 minutes, compared with 12-16 minutes with a data loader.
Upon entering DFCS BITE, if the FCC’s installed on the aircraft have different OPS part numbers, page 3/3 of the INDENTIFICATION AND CONFIGURATION pages will automatically show on the MCDU.
This page will list the OPS software part numbers for the FCC’s. You then have the option of crossloading from FCC A to B using Line Select Key (LSK) 5L, or FCC B to A using LSK 5R.
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SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
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OR

MASTER FCC CANNOT ENTER BITE  MASTER FCC ENTERS BITE BUT  NEITHER FCC CAN GET THE 
NON-MASTER FCC CANNOT  MESSAGES TO THE FMC 
DFCS BITE PAGES - FCC BITE ENTRY FAILURE 

January 1, 2004
22-11
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
DFCS BITE PAGES - DFCS BITE TEST
General
If FCC A and FCC B can enter BITE, the MCDU shows that the DFCS is in the selftest mode. The DFCS selftest has an FCC A selftest and an FCC B selftest. There is also a test of the cross channel buses. After the selftest, the MCDU shows one of these pages:
-DFCS BITE TEST MAIN MENU
-FCC-A/B SELFTEST PASS, CROSS CHANNEL TEST FAIL
-FCC-A/B SELFTEST FAIL, CROSS CHANNEL TEST PASS.
DFCS BITE MAIN MENU Page
This page lets you choose a fault isolation or verification test.
FCC-A/B SELFTEST PASS, CROSS CHANNEL TEST FAIL Page
This page shows that the FCCs passed their selftests, but the cross channel test failed. You can go back to the MAINT BITE INDEX page or continue to show the failed results. After you see the failed results, you can go to the MAINT BITE INDEX or continue to the MAIN MENU.
FCC-A/B SELFTEST FAIL, CROSS CHANNEL TEST PASS Page
This page shows that the FCCs failed their selftests, but the cross channel test passed. You can go back to the MAINT BITE INDEX page or conitnue to show the failed results.
January 1, 2004
22-11
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