W DOC AIRBUS | AMM A320F

Functional Check of LGCIU Power Supply Relays

TASK 32-31-00-720-008-A
Functional Check of LGCIU Power Supply Relays

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
  • THE FLIGHT CONTROLS
  • THE FLIGHT CONTROL SURFACES
  • THE LANDING GEAR AND THE RELATED DOORS
  • COMPONENTS THAT MOVE.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
ZONE: 210
1. Reason for the Job
Refer to the MPD TASK: 323000-17
FUNCTIONAL CHECK OF LGCIU POWER SUPPLY RELAYS.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SAFETY BARRIER(S)
No specific
1
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 21-31-00-710-002-A
Operational Test of the Pressure Control and Monitoring
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A
Depressurize the Yellow Hydraulic System
TASK 31-32-00-860-009-A
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-860-001-A
Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01
Flight Configuration Precautions without Electrical Power
TASK 32-00-00-860-002-A
Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01
Ground Configuration after Flight Configuration without Electrical Power
TASK 32-69-00-740-001-A
BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
F Landing Gear ECAM Display- CRT Display ** ON A/C NOT FOR ALL
F Landing Gear ECAM Display- LCD Display (S8-2, S9, S10 or S11) ** ON A/C NOT FOR ALL
F Landing Gear ECAM Display- LCD Display (S4-2 or S7) ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 32-31-00-941-095-B
A. Safety Precautions
   (1) Put the SAFETY BARRIER(S) in position.
   (2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
   (3) On the panel 400VU:
  • make sure that the landing-gear control-lever 6GA is in the DOWN position
  • put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.
Subtask 32-31-00-860-121-B
B. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (2) Depressurize the green and yellow hydraulic systems (Ref. AMM TASK 29-10-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
   (3) Do the EIS start procedure (ECAM only) (Ref. AMM TASK 31-60-00-860-001).
   (4) On the ECAM control panel (CP), push (in) the WHEEL pushbutton switch (P/BSW). Make sure that the WHEEL page shows on the ECAM lower display unit (DU).
Subtask 32-31-00-869-118-B
C. Flight Configuration Precautions
   (1) Do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.
Subtask 32-31-00-865-123-A
D. Open this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-31-00-869-119-B
E. Cockpit Configuration
   (1) Get access to the L/G page on the MCDU (Ref. AMM TASK 31-32-00-860-009).
Subtask 32-31-00-865-139-A
F. Table of the circuit breakers referred to in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUAIR COND/CAB/PRESS/CTL11HLD09
122VUAIR COND/CAB PRESS/CTL/MAN3HLY23
122VUAIR COND/CAB PRESS/CTL/22HLY22
4. Procedure
Subtask 32-31-00-720-077-B
A. Functional Check of LGCIU Power Supply Relays (60GA/61GA)
   (1) Do the functional check of relay 60GA, as follows:
ACTION
RESULT
1.Make sure that the circuit breakers that follow are open:
  • 1GA, 2GA, 52GA, 58GA and 59GA.
On the lower ECAM Display Unit (DU) Wheel page:
  • All the LG symbols are amber 'XX'.
  • LGCIU1 and LGCIU2 are set to off.
2.On panel 121VU:
  • Close circuit breaker 52GA.
LGCIU1 is set to on.
3.Do a check of the lower ECAM DU Wheel page.
Some of the 'XX' symbols will change to green triangles and some 'XX' symbols will stay amber below the MLG LEFT, the MLG RIGHT and the NLG.
4.Do a BITE test of LGCIU1 at the MCDU (Ref. AMM TASK 32-69-00-740-001).
The MCDU shows the message 'test OK'.
5.On panel 121VU:
  • Make sure that circuit breaker 52GA is closed.
  • Open circuit breaker 52GA.
On the lower ECAM DU Wheel page:
  • All the LG symbols are amber 'XX' below the MLG LEFT, the MLG RIGHT and the NLG.
  • LGCIU1 is set to off.
6.On panel 49VU:
  • Close circuit breaker 1GA.
On the lower ECAM DU Wheel page:
  • Some of the amber 'XX' symbols change to green triangles.
  • LGCIU1 is set to on.
7.On panel 121VU:
  • Close circuit breaker 58GA.
On the lower ECAM DU Wheel page there is no change to the display.
8.On panel 49VU:
  • Open circuit breaker 1GA.
On the lower ECAM DU Wheel page:
  • Make sure that the symbols stay green triangles for 10 seconds +/- 2 seconds. The green triangles then change to amber 'XX' below the MLG LEFT, the MLG RIGHT and the NLG.
9.On panel 121VU:
  • Open circuit breaker 58GA.
On the lower ECAM DU Wheel page there is no change to the display.
   (2) Do the functional check of relay 61GA, as follows:
ACTION
RESULT
1.Make sure that the circuit breakers that follow are open:
  • 1GA, 2GA, 52GA, 58GA and 59GA
On the lower ECAM DU Wheel page:
  • All the LG symbols are amber 'XX'.
  • LGCIU1 and LGCIU2 are set to off.
2.On panel 121VU:
  • Close circuit breaker 2GA.
On the lower ECAM DU Wheel page:
  • Some of the amber 'XX' symbols change to green triangles.
  • LGCIU2 is set to on.
3.On panel 121VU:
  • Close circuit breaker 59GA.
On the lower ECAM DU Wheel page, there is no change to the display.
4.On panel 121VU:
  • Open circuit breaker 2GA.
On the lower ECAM DU Wheel page:
  • Make sure that the symbols stay green triangles for 10 seconds +/- 2 seconds. The green triangles then change to amber 'XX' below the MLG LEFT, the MLG RIGHT and the NLG.
5.Do the BITE test as follows:
  • On panel 121VU, close circuit breaker 2GA.
  • On panel 49VU, close circuit breaker 1GA.
  • Do a BITE test of LGCIU2 at the MCDU (Ref. AMM TASK 32-69-00-740-001).

    NOTE: To do the BITE test of LGCIU2, the Centralized Fault Display System (CFDS) must receive a ground signal from LGCIU1.



The MCDU shows the message 'test OK'.
6.On panel 121VU:
  • Close circuit breaker 58GA.

7.On panel 121VU:
  • Close circuit breaker 52GA.

NOTE: When the LGCIU circuit breakers are open, the fuel used indication shown on the ENG page and the FUEL USED page will change to 'degraded' mode. The fuel used indication will show as dashes. It is necessary to start the engines to show the correct display of the fuel used indication.
NOTE: After the LGCIU power supply relay test, make sure the Cabin Pressure Control (CPC) is in ground mode.
   (3) Re-set the CPC:
     (a) For CPC 1:
       1 Open circuit breaker 1HL.
       2 After two seconds minimum, close circuit breaker 1HL.
       3 Do steps 1_ and 2_ again.
     (b) For CPC 2:
       1 Open circuit breakers 2HL and 3HL.
       2 After two seconds minimum, close circuit breakers 2HL and 3HL.
       3 Do steps 1_ and 2_ again.
NOTE: When the circuit breaker(s) for the related CPC is(are) closed again the CPC power-up test starts.
   (4) Do an operational test of the pressure control and monitoring (Ref. AMM TASK 21-31-00-710-002).
5. Close-up
Subtask 32-31-00-865-124-A
A. Close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-31-00-860-122-B
B. Aircraft Maintenance Configuration
   (1) Put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
   (2) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
   (3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
Subtask 32-31-00-942-098-B
C. Removal of Equipment
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the SAFETY BARRIER(S).
   (3) Remove the WARNING NOTICE(S).
   (4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.04.01 00:44:13 UTC
"Aviabrain" 2025