Loss of the Ground Conditions on the FMGC 1

TASK 22-83-00-810-869-A
Loss of the Ground Conditions on the FMGC 1

1. Possible Causes

FMGC-1 [1CA1]
LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
wiring of the NOSE GEAR OWN discrete from the FMGC 1 (1CA1) to the LGCIU 1 (5GA1)
wiring of the NOSE GEAR OPP discrete from the FMGC 1 (1CA1) to the LGCIU 2 (5GA2)
wiring of the ENG OWN STOP and ENG OPP STOP discretes (from the FMGC 1 (1CA1) to the diode module (1801VD))
wiring of the diode module 1801VD
DIODE MODULE (1801VD)
wiring of the FMGC OWN A discrete from the FMGC 1 (1CA1) 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 22-83-00-710-167-A

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

4. Fault Isolation
Subtask 22-83-00-810-150-A

A. On the MCDU 1, 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 1 (1CA1) to the LGCIU 1 (5GA1)
do a check of the wiring of the NOSE GEAR OPP discrete from the FMGC 1 (1CA1) to the LGCIU 2 (5GA2)

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 1 (1CA1) to the diode module (1801VD)) ASM 228504.

1 If there is no continuity:

2 If there is continuity:

do a check of the wiring of the diode module 1801VD from pin A/10 and from pin A/11 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 1 (1CA1) to the FAC 1 (1CC1) ASM 226901.

Subtask 22-83-00-710-168-A

B. Do the test given in Para. 3.

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