Loss of the CPMU data by the ATSU

TASK 46-21-00-810-818-A
Loss of the CPMU data by the ATSU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-74-31-000-001	Removal of the Cabin Management Terminal
AMM 23-74-31-400-001	Installation of the Cabin Management Terminal
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 46-21-00-740-082-A

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

4. Fault Isolation
Subtask 46-21-00-810-066-A

A. If the test gives the maintenance message CT1(2RF)/ATSU1(1TX1):

(1) If the fault continues:

(a) If the fault continues:

remove the Cabin Management Interface Unit and the ATSU
do a check and repair the wiring of the Cabin Terminal 1 DATA BUS : between the ATSU and the Cabin Management Interface Unit ASM 462105.
install the Cabin Management Interface Unit and the ATSU

Subtask 46-21-00-740-083-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:19 UTC