Loss of Communication with the FMGC 1 through the MCDU 1

TASK 22-82-00-810-811-A
Loss of Communication with the FMGC 1 through the MCDU 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-70-00-710-001	Operational Test of the Multipurpose Control and Display Unit (MCDU)
AMM 22-82-12-000-001	Removal of the MCDU
AMM 22-82-12-400-002	Installation of the MCDU
AMM 22-83-34-000-001	Removal of the FMGC
AMM 22-83-34-400-001	Installation of the FMGC
ASM 228504
ASM 228604

3. Fault Confirmation
Subtask 22-82-00-710-070-A

A. Test
(1) Do the operational test of the Multipurpose Control and Display Unit (MCDU 1) AMM 22-70-00-710-001.

4. Fault Isolation
Subtask 22-82-00-810-068-A

A. If the A/C status page does not come into view:

(1) If the fault continues:

(2) If the fault continues:

do a check of the wiring of the MCDU OWN OUT bus from the FMGC 1 (1CA1) to the MCDU 1 (3CA1) ASM 228604.

(a) If there is no continuity:

(b) If there is continuity:

do a check and repair the wiring of the FMGC HLTY discrete from the FMGC 1 (1CA1) to the MCDU 1 (3CA1) ASM 228504.

Subtask 22-82-00-710-071-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:27 UTC