Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-004-A-02
Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 34-10-00-860-083-A ** ON A/C NOT FOR ALL
Subtask 34-10-00-860-084-C ** ON A/C NOT FOR ALL
Subtask 34-10-00-865-095-A
[Rev.10 from 2021]
2026.04.01 00:57:55 UTC
Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
NOTE: The time necessary to do the IR alignment is:
- 15 minutes if the latitude is more than 73°S
- 10 minutes if the latitude is between 73°S and 73°N
- 15 minutes if the latitude is more than 73°N.
ZONE: 210
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 822 |
| REFERENCE | DESIGNATION |
|---|---|
| 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 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
Subtask 34-10-00-860-083-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the overhead panel:
(a) On the ADIRS CDU, make sure that the three OFF/NAV/ATT selector switches are set to OFF.
(4) On the glareshield panel, on the CAPT and F/O EFIS control-sections of the Flight Control Unit (FCU), set the mode selector switches to ROSE/NAV.
(5) During the alignment, set the NAV mode, and until the NAV mode is shown, make sure that the aircraft does not move.
Subtask 34-10-00-860-083-C ** ON A/C NOT FOR ALL (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the overhead panel:
(a) On the ADIRS CDU, make sure that the three OFF/NAV/ATT selector switches are set to OFF.
(4) On the glareshield panel, on the CAPT and F/O EFIS control-sections of the Flight Control Unit (FCU), set the mode selector switches to ROSE/NAV.
(5) During the alignment, set the NAV mode, and until the NAV mode is shown, make sure that the aircraft does not move.
NOTE: The time for the alignment is shown:
- On the right side of the ADIRS CDU, if the DATA DISPLAY selector switch is set to HDG. The indication shown is TTN5.
- On the upper ECAM DU, from 6 MN to 1 MN. The indication shown is IRS IN ALIGN 6 MN.
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the overhead panel:
(a) On ADIRS MSU panel 41VU, make sure that the three OFF/NAV/ATT selector switches are set to OFF.
(4) On the glareshield panel, on the CAPT and F/O EFIS control-sections of the Flight Control Unit (FCU), set the mode selector switches to ROSE/NAV.
(5) During the alignment, set the NAV mode, and until the NAV mode is shown, make sure that the aircraft does not move.
Subtask 34-10-00-010-069-A (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the overhead panel:
(a) On ADIRS MSU panel 41VU, make sure that the three OFF/NAV/ATT selector switches are set to OFF.
(4) On the glareshield panel, on the CAPT and F/O EFIS control-sections of the Flight Control Unit (FCU), set the mode selector switches to ROSE/NAV.
(5) During the alignment, set the NAV mode, and until the NAV mode is shown, make sure that the aircraft does not move.
NOTE: The time for the alignment is shown on the upper ECAM DU, from 6 MN to 1 MN. The indication shown is IRS IN ALIGN 6 MN.
B. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position below access door 822.
(2) Open access door 822.
(3) On battery power center 105VU:
Subtask 34-10-00-865-093-A (1) Put the ACCESS PLATFORM 1M(3 FT) in position below access door 822.
(2) Open access door 822.
(3) On battery power center 105VU:
- Loosen the two screws and remove the protective cover.
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 34-10-00-865-094-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | NAV PROBES/ADIRU3/PWR/SWTG | 8FP | F09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AUTO FLT/FCU/1 | 9CA1 | B05 |
| 49VU | AUTO FLT/FMGC/1 | 10CA1 | B02 |
| 49VU | AUTO FLT/MCDU/1 | 11CA1 | B01 |
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| 49VU | NAV PROBES/ADIRU 1/AND AOA 1/26VAC | 5FP1 | F07 |
| 49VU | NAV PROBES/ADIRU1/115VAC | 4FP1 | F06 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | NAV PROBES/ADIRU3/PWR/SWTG | 8FP | F08 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AUTO FLT/FCU/1 | 9CA1 | H11 |
| 49VU | AUTO FLT/FMGC/1 | 10CA1 | H08 |
| 49VU | AUTO FLT/MCDU/1 | 11CA1 | H07 |
| ** ON A/C ALL | |||
| 105VU | ADIRS/ADIRU1/28VDC | 6FP1 | C02 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ADIRS/ADIRU/2PWR/SHED | 10FP | N10 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | CFDS/CFDIU/SPLY | 2TW | J18 |
| 121VU | CFDS/CFDIU/BACK/UP | 8TW | J17 |
| ** ON A/C ALL | |||
| 121VU | AUTO FLT/FCU/2 | 9CA2 | M21 |
| 121VU | AUTO FLT/FMGC/2 | 10CA2 | M17 |
| 121VU | AUTO FLT/MCDU/2 | 11CA2 | N20 |
| 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 |
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ADIRS/2PWR/SHED &/AOA2 MON | 10FP | N10 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | CFDS/CFDIU/SPLY | 2TW | J41 |
| 121VU | CFDS/CFDIU/BACK/UP | 8TW | J40 |
D. Open this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | SATCOM | 240RV | K01 |
Subtask 34-10-00-860-084-C ** ON A/C NOT FOR ALL
A. IR Alignment from the Multipurpose Control and Display Unit (MCDU):
Subtask 34-10-00-860-084-E ** ON A/C NOT FOR ALL | ACTION | RESULT |
|---|---|
1.On rear circuit-breaker panel 121VU:
| |
2.On Air Data/Inertial Reference System (ADIRS) Mode Selector Unit (MSU) panel 41VU:
| On ADIRS MSU panel 41VU:
|
| 3.On MCDU1 or 2: | On MCDU1 or 2: |
| |
| The MCDU MENU page comes into view. |
| |
| The INIT A page comes into view. |
| The code number is shown on the scratchpad line (in the bottom part of the MCDU). |
|
|
|
NOTE: You can increase or decrease the latitude or/and longitude as shown in Para. 4 and 5. If no latitude or longitude change is necessary, you can go to Para. 6. NOTE: If you enter an incorrect longitude two times in sequence during PPOS entry, the Air Data/Inertial Reference Unit (ADIRU) will accept this position until the subsequent alignment. |
| 4.For the latitude change: | |
| The latitude coordinates increase or decrease:
|
| 5.For the longitude change: | |
| The slew prompts (the up and down arrows) move to the LONG indication. |
| The longitude coordinates increase or decrease as the LAT indication. |
| 6.On the MCDU, push the line key adjacent to the ALIGN ON REF indication. | On the MCDU, the amber CONFIRM ALIGN* indication is shown on the line adjacent to line key 6R. |
| 7.On the MCDU, push the line key adjacent to the CONFIRM ALIGN* indication. | The IRS alignment process starts. After approximately five minutes:
|
8.On overhead circuit-breaker panel 49VU:
| |
9.On rear circuit-breaker panel 121VU:
| |
| 10.Do the same test from Para. 2. | The results are the same. |
11.On overhead circuit-breaker panel 49VU:
| |
A. IR Alignment from the Multipurpose Control and Display Unit (MCDU):
Subtask 34-10-00-860-084-F ** ON A/C NOT FOR ALL | ACTION | RESULT |
|---|---|
1.On rear circuit-breaker panel 121VU:
| |
2.On Air Data/Inertial Reference System (ADIRS) Mode Selector Unit (MSU) panel 41VU:
| On ADIRS MSU panel 41VU:
|
| 3.On the MCDU: | On the MCDU: |
| The MCDU MENU page comes into view. |
| The aircraft status page comes into view. |
| The INIT page comes into view. |
| The code number is shown on the scratchpad line (in the bottom part of the MCDU). |
|
|
|
NOTE: You can increase or decrease the latitude or/and longitude as shown in Para. 4 and 5. If no latitude or longitude change is necessary, you can go to Para. 6. NOTE: If you enter an incorrect longitude two times in sequence during PPOS entry, the Air Data/Inertial Reference Unit (ADIRU) will accept this position until the subsequent alignment. |
| 4.For the latitude change: | |
| The latitude coordinates increase or decrease:
|
| 5.For the longitude change: | |
| The slew prompts (the up and down arrows) move to the LONG indication. |
| The longitude coordinates increase or decrease as the LAT indication. |
| 6.On the MCDU, push the line key adjacent to the ALIGN IRS indication. | On the MCDU, the ALIGN IRS indication goes out of view. After approximately five minutes:
|
7.On overhead circuit-breaker panel 49VU:
| |
8.On rear circuit-breaker panel 121VU:
| |
| 9.Do the same test from Para. 2. | The results are the same. |
10.On overhead circuit-breaker panel 49VU:
| |
A. IR Alignment from the Multipurpose Control and Display Unit (MCDU):
Subtask 34-10-00-860-084-H ** ON A/C NOT FOR ALL | ACTION | RESULT |
|---|---|
1.On rear circuit-breaker panel 121VU:
| |
2.On Air Data/Inertial Reference System (ADIRS) Mode Selector Unit (MSU) panel 41VU:
| On ADIRS MSU panel 41VU:
|
| 3.On the MCDU: | On the MCDU: |
| The MCDU MENU page comes into view. |
| The aircraft status page comes into view. |
| The INIT page comes into view. |
| The code number is shown on the scratchpad line (in the bottom part of the MCDU). |
|
|
|
NOTE: You can increase or decrease the latitude or/and longitude as shown in Para. 4 and 5. If no latitude or longitude change is necessary, you can go to Para. 6. NOTE: If you enter an incorrect longitude two times in sequence during PPOS entry, the Air Data/Inertial Reference Unit (ADIRU) will accept this position until the subsequent alignment. |
| 4.For the latitude change: | |
| The latitude coordinates increase or decrease:
|
| 5.For the longitude change: | |
| The slew prompts (the up and down arrows) move to the LONG indication. |
| The longitude coordinates increase or decrease as the LAT indication. |
| 6.On the MCDU, push the line key adjacent to the ALIGN ON REF indication. | On the MCDU, the amber CONFIRM ALIGN* indication is shown on the line adjacent to line key 6R. |
| 7.On the MCDU, push the line key adjacent to the CONFIRM ALIGN* indication. | The IRS alignment process starts. After approximately five minutes:
|
8.On overhead circuit-breaker panel 49VU:
| |
9.On rear circuit-breaker panel 121VU:
| |
| 10.Do the same test from Para. 2. | The results are the same. |
11.On overhead circuit-breaker panel 49VU:
| |
A. IR Alignment from the Multipurpose Control and Display Unit (MCDU):
Subtask 34-10-00-860-084-I ** ON A/C NOT FOR ALL | ACTION | RESULT |
|---|---|
1.On rear circuit-breaker panel 121VU:
| |
2.On Air Data/Inertial Reference System (ADIRS) Mode Selector Unit (MSU) panel 41VU:
| On ADIRS MSU panel 41VU:
|
| 3.On the MCDU: | On the MCDU: |
| The MCDU MENU page comes into view. |
| The aircraft status page comes into view. |
| The INIT page comes into view. |
| The code number is shown on the scratchpad line (in the bottom part of the MCDU). |
|
|
|
NOTE: You can increase or decrease the latitude or/and longitude as shown in Para. 4 and 5. If no latitude or longitude change is necessary, you can go to Para. 6. NOTE: If you enter an incorrect longitude two times in sequence during PPOS entry, the Air Data/Inertial Reference Unit (ADIRU) will accept this position until the subsequent alignment. |
| 4.For the latitude change: | |
| The latitude coordinates increase or decrease:
|
| 5.For the longitude change: | |
| The slew prompts (the up and down arrows) move to the LONG indication. |
| The longitude coordinates increase or decrease as the LAT indication. |
| 6.On the MCDU, push the line key adjacent to the ALIGN ON REF indication. | On the MCDU, the amber CONFIRM ALIGN* indication is shown on the line adjacent to line key 6R. |
| 7.On the MCDU, push the line key adjacent to the CONFIRM ALIGN* indication. | The IRS alignment process starts. After approximately five minutes:
|
8.On overhead circuit-breaker panel 49VU:
| |
9.On rear circuit-breaker panel 121VU:
| |
| 10.Do the same test from Para. 2. | The results are the same. |
11.On overhead circuit-breaker panel 49VU:
| |
A. IR Alignment from the Multipurpose Control and Display Unit (MCDU):
5. Close-up| ACTION | RESULT |
|---|---|
1.On rear circuit-breaker panel 121VU:
| |
2.On the Air Data/Inertial Reference System (ADIRS) Control and Display Unit (CDU):
| On the ADIRS CDU:
|
| |
| 3.On the MCDU: | On the MCDU: |
| The MCDU MENU page comes into view. |
| The aircraft status page comes into view. |
| The INIT page comes into view. |
| The code number is shown on the scratchpad line (in the bottom part of the MCDU). |
|
|
|
NOTE: You can increase or decrease the latitude or/and longitude as shown in Para. 4 and 5. If no latitude or longitude change is necessary, you can go to Para. 6. NOTE: If you enter an incorrect longitude two times in a sequence during PPOS entry, the Air Data/Inertial Reference Unit (ADIRU) will accept this position until the subsequent alignment. |
| 4.For the latitude change: | |
| The latitude coordinates increase or decrease:
|
| 5.For the longitude change: | |
| The slew prompts (the up and down arrows) move to the LONG indication. |
| The longitude coordinates increase or decrease as the LAT indication. |
| 6.On the MCDU, push the line key adjacent to the ALIGN ON REF indication. | On the MCDU, the amber CONFIRM ALIGN* indication is shown on the line adjacent to line key 6R. |
| 7.On the MCDU, push the line key adjacent to the CONFIRM ALIGN* indication. | The IRS alignment process starts. |
| 8.On the ADIRS CDU, set the SYS DISPLAY selector switch to 2, then to 3 and make sure that the coordinates shown are the same for the three ADIRUs. Set the SYS DISPLAY selector switch to 1. | The coordinates which are in view on the ADIRS CDU are the same as the coordinates shown on the MCDU. After approximately five minutes:
|
9.On overhead circuit-breaker panel 49VU:
| |
10.On rear circuit-breaker panel 121VU:
| |
| 11.Do the same test from Para. 2. | The results are the same. |
12.On overhead circuit-breaker panel 49VU:
| |
Subtask 34-10-00-865-095-A
A. Close this(these) circuit breaker(s):
Subtask 34-10-00-410-069-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | SATCOM | 240RV | K01 |
B. Close Access
(1) Install the protective cover on battery power center 105VU.
(2) Tighten the two screws.
(3) Close access door 822.
(4) Remove the access platform(s).
Subtask 34-10-00-860-088-A (1) Install the protective cover on battery power center 105VU.
(2) Tighten the two screws.
(3) Close access door 822.
(4) Remove the access platform(s).
C. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).