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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NON-MASTER FCC CANNOT MESSAGES TO THE FMC
DFCS BITE PAGES - FCC BITE ENTRY FAILURE
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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.
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EXIT RETURNS TO
MAINT BITE INDEX PAGE
DFCS BITE PAGES - DFCS BITE TEST
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DFCS BITE PAGES - BITE TEST EXIT
DFCS BITE MAIN MENU Page
If you want to get out of BITE from the MAIN MENU page, push LSK 6L, EXIT prompt. This shows the TEST COMPLETE page.
TEST COMPLETE Page
This page asks whether you want to stay in DFCS BITE or go out of the BITE. To stay in BITE, push the MAIN MENU prompt, LSK 6R and to go out of BITE, push the EXIT prompt, LSK 6L. When you push LSK 6R, you go back to the DFCS BITE MAIN MENU page. When you push LSK 6L, you go to the END OF DFCS BITE page.
END OF DFCS BITE Page
This page gives instructions on what you need to do before you can go out of BITE. To continue, push LSK 6L and you will go back to the MAINT BITE INDEX page or to the SETUP INCORRECT page.
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