Loss of the Ground Conditions on the FMGC 2

TASK 22-83-00-810-870-A
Loss of the Ground Conditions on the FMGC 2

1. Possible Causes

FMGC-2 [1CA2]
LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
wiring of the NOSE GEAR OWN discrete from the FMGC 2 (1CA2) to the LGCIU 2 (5GA2)
wiring of the NOSE GEAR OPP discrete from the FMGC 2 (1CA2) to the LGCIU 1 (5GA1)
wiring of the ENG OWN STOP and ENG OPP STOP discretes (from the FMGC 2 (1CA2) to the diode modules (1800VD and 1801VD))
wiring of the diode module 1800VD
wiring of the diode module 1801VD
DIODE MODULE (1800VD)
DIODE MODULE (1801VD)
wiring of the FMGC OWN A discrete from the FMGC 2 (1CA2) to the FAC 1 (1CC1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 226901
AMM 22-83-34-000-001	Removal of the FMGC
AMM 22-83-34-400-001	Installation of the FMGC
ASM 228504
AMM 22-97-00-710-001	Operational Test of the LAND CAT III Capability
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 22-83-00-710-169-A

A. Test
(1) Do the operational test of the LAND CAT III capability AMM 22-97-00-710-001.

4. Fault Isolation
Subtask 22-83-00-810-151-A

A. On the MCDU 2, if the LAND TEST REFUSED message comes into view:

(1) If the fault continues:

(2) If the fault continues:

(3) If the fault continues:

do a check of the wiring of the NOSE GEAR OWN discrete from the FMGC 2 (1CA2) to the LGCIU 2 (5GA2)
do a check of the wiring of the NOSE GEAR OPP discrete from the FMGC 2 (1CA2) to the LGCIU 1 (5GA1)

ASM 228504.
(a) If there is no continuity:

(b) If there is continuity:

do a check of the wiring of the ENG OWN STOP and ENG OPP STOP discretes (from the FMGC 2 (1CA2) to the diode modules (1800VD and 1801VD)) ASM 228504.

1 If there is no continuity:

2 If there is continuity:

do a check of the wiring of the diode module 1800VD from pin A/8 to the first terminal block
do a check of the wiring of the diode module 1801VD from pin A/8 to the first terminal block

ASM 228504
a If there is no continuity:

b If there is continuity:

(4) If the fault continues:

do a check and repair the wiring of the FMGC OWN A discrete from the FMGC 2 (1CA2) to the FAC 1 (1CC1) ASM 226901.

Subtask 22-83-00-710-170-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:33 UTC