SYSTEM TEST of the Inertial Reference A320
NOTE: If you do the test while the aircraft is in a hangar, the GPS/MMR faults will be generated if the GPS satellite signal is not available.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
B. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| Ref. 24-41-00-861-002-A01 | Energize the Aircraft Electrical Circuits from the APU |
| Ref. 24-41-00-861-002-A02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| Ref. 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| Ref. 24-41-00-862-002-A01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| Ref. 24-41-00-862-002-A02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| Ref. 31-32-00-860-010-A | Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page |
| Ref. 34-10-00-860-002-A | ADIRS Start Procedure |
| Ref. 34-10-00-860-005-A | ADIRS Stop Procedure |
3. Job Set-up
SUBTASK 34-14-00-860-061-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits Ref. AMM TASK 24-41-00-861-002
(2) Do the Air Data/Inertial Reference System (ADIRS) start procedure Ref. AMM TASK 34-10-00-860-002.
(3) Get the SYSTEM REPORT/TEST NAV menu page Ref. AMM TASK 31-32-00-860-010.
SUBTASK 34-14-00-875-053-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
| PANEL | DESIGNATION | FIN | LOCATION |
| 49VU | NAV PROBES/ADIRU3/PWR/SWTG | 8FP | F09 |
| 49VU | NAV PROBES/ADIRU 1/AND AOA 1/26VAC | 5FP1 | F07 |
| 49VU | NAV PROBES/ADIRU1/115VAC | 4FP1 | F06 |
| 105VU | ADIRS/ADIRU1/28VDC | 6FP1 | C02 |
| 121VU | ADIRS/ADIRU/2PWR/SHED | 10FP | N10 |
| 121VU | ADIRS/ADIRU/3PWR/SWTG | 9FP | N09 |
| 121VU | ADIRS/ADIRU/2/26VAC AND AOA | 5FP2 | N08 |
| 121VU | ADIRS/ADIRU/3/26VAC AND AOA | 5FP3 | N07 |
| 121VU | ADIRS/ADIRU/2/115VAC | 4FP2 | N06 |
| 121VU | ADIRS/ADIRU/3/115VAC | 4FP3 | N05 |
| 121VU | ADIRS/ADIRU/2/28VDC | 6FP2 | N04 |
| 121VU | ADIRS/ADIRU/3/28VDC | 6FP3 | N03 |
4. Procedure
SUBTASK 34-14-00-740-069-B
- SYSTEM TEST of the Inertial Reference (IR)
NOTE:
— This test is for system 1. For systems 2 and 3, use the indications between the parentheses.
The actions and the results of this procedure occur on the Multipurpose Control and Display Unit (MCDU) that you operate.
— It is not necessary to do an Inertial References (IR) alignment procedure before you start the IR SYSTEM TEST. An automatic alignment of the IRs occurs during the IR SYSTEM TEST.
— If the IRs are aligned before you start the IR SYSTEM TEST, a new alignment is necessary after the IR SYSTEM TEST (only if the ADIRUs must be operative, if not set the ADIRUs to off).
| ACTION | RESULT |
| 1.On the SYSTEM REPORT/TEST ATA 34 page, push the line key adjacent to the NAV indication. | -The SYSTEM REPORT/TEST : NAV menu page comes into view. |
| 2.Push the line key adjacent to the IR 1(2,3) indication. | -The IR 1(2,3) page comes into view. |
| 3.On the IR 1(2,3) page, push the line key adjacent to the SYSTEM TEST indication. | -The IR 1(2,3) SYSTEM TEST page comes into view. |
| 4.Push the line key adjacent to the START TEST indication. | -The TEST IN PROGRESS 40 s indication comes into view.-At the end of the test, the TEST OK indication comes into view. |
| 5.Push the line key adjacent to the TEST CLOSE UP indication. | -These indications come into view:* TEST CLOSE UP. IR RE-ALIGNMENT* ENTER PPOS WITH THE OTHER MCDU.-(Refer to the NOTE given in Para A). |
| 6.Push the line key adjacent to the RETURN indication. | -The test procedure stops. |
5. Close-up
SUBTASK 34-14-00-860-062-A
A. Put the Aircraft back to its Initial Configuration
(1) Do the ADIRS stop procedure Ref. AMM TASK 34-10-00-860-005.
(2) On the MCDU, push the line key adjacent to the RETURN indication until the MAINTENANCE MENU 1/2 page comes into view.
(3) On the MCDU, set the BRT knob to OFF.
(4) De-energize the aircraft electrical circuits Ref. AMM TASK 24-41-00-862-002.
