Loss of the FMGC1 FM ACARS Input Signal

TASK 46-21-00-810-807-A
Loss of the FMGC1 FM ACARS Input Signal

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-83-34-000-001	Removal of the FMGC
AMM 22-83-34-400-001	Installation of the FMGC
AMM 46-21-00-740-001	BITE Test of the ATIMS
ASM 462105
AMM 46-21-34-000-001	Removal of the Air Traffic Service Unit (ATSU)
AMM 46-21-34-400-001	Installation of the Air Traffic Service Unit (ATSU)

3. Fault Confirmation
Subtask 46-21-00-740-062-A

A. Test
(1) Do the BITE test of the ATIMS AMM 46-21-00-740-001.

4. Fault Isolation
Subtask 46-21-00-810-056-A

A. If the test gives the maintenance message :
FMGC1(1CA1) BUS FM ACARS/ATSU1(1TX1):

(1) If the fault continues:

(a) If the fault continues:

remove the FMGC 1 and the ATSU
do a check and repair the wiring of the PRINTER ACARS & ATSU DATA BUS: between pins AB/12F,12G of the FMGC 1 and pins AA/7C,7D of the ATSU ASM 462105
install the FMGC 1 and the ATSU.

Subtask 46-21-00-740-063-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:18 UTC