W DOC AIRBUS | AMM A320F

Automatic Inertial Reference (IR) Alignment-Procedure

TASK 34-10-00-860-004-A-01
Automatic Inertial Reference (IR) Alignment-Procedure

NOTE: Do this procedure in an open area (not in a hangar).
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 Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 1M(3 FT)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
822
 C. Referenced Information
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 31-60-00-860-001-A
EIS Start Procedure
TASK 34-10-00-860-004-A
Inertial Reference (IR) Alignment-Procedure
3. Job Set-up
Subtask 34-10-00-860-080-D ** 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:
  • 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 FCU, set the mode selector switches to ROSE/NAV.
NOTE: During the alignment, it is necessary to get the NAV mode, and until the NAV mode is shown, the aircraft must not move.
NOTE: The time for alignment is shown on the upper ECAM DU, from 6 MN to 1 MN. The indication shown is IN ALIGN 6 MN.
Subtask 34-10-00-010-068-B ** ON A/C NOT FOR ALL
B. Get Access
   (1) Put the ACCESS PLATFORM 1M(3 FT) in position at access door 822.
   (2) Open access door 822.
   (3) On battery power center 105VU:
  • Loosen the two screws and remove the protective cover.
Subtask 34-10-00-865-087-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUNAV PROBES/ADIRU3/PWR/SWTG8FPF09
** ON A/C NOT FOR ALL
49VUAUTO FLT/FCU/19CA1B05
49VUAUTO FLT/FMGC/110CA1B02
49VUAUTO FLT/MCDU/111CA1B01
** ON A/C NOT FOR ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
49VUNAV PROBES/ADIRU 1/AND AOA 1/26VAC5FP1F07
49VUNAV PROBES/ADIRU1/115VAC4FP1F06
49VUNAV/MMR/142RT1G12
** ON A/C NOT FOR ALL
49VUNAV PROBES/ADIRU3/PWR/SWTG8FPF08
** ON A/C NOT FOR ALL
49VUAUTO FLT/FCU/19CA1H11
49VUAUTO FLT/FMGC/110CA1H08
49VUAUTO FLT/MCDU/111CA1H07
** ON A/C NOT FOR ALL
105VUADIRS/ADIRU1/28VDC6FP1C02
** ON A/C NOT FOR ALL
121VUADIRS/ADIRU/2PWR/SHED10FPN10
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ18
121VUCFDS/CFDIU/BACK/UP8TWJ17
** ON A/C NOT FOR ALL
121VUCOM NAV/MMR/242RT2L07
121VUAUTO FLT/FCU/29CA2M21
121VUAUTO FLT/FMGC/210CA2M17
121VUAUTO FLT/MCDU/211CA2N20
121VUADIRS/ADIRU/3PWR/SWTG9FPN09
121VUADIRS/ADIRU/2/26VAC AND AOA5FP2N08
121VUADIRS/ADIRU/3/26VAC AND AOA5FP3N07
121VUADIRS/ADIRU/2/115VAC4FP2N06
121VUADIRS/ADIRU/3/115VAC4FP3N05
121VUADIRS/ADIRU/2/28VDC6FP2N04
121VUADIRS/ADIRU/3/28VDC6FP3N03
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VUADIRS/2PWR/SHED &/AOA2 MON10FPN10
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ41
121VUCFDS/CFDIU/BACK/UP8TWJ40
Subtask 34-10-00-865-091-A ** ON A/C NOT FOR ALL
D. Open this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUSATCOM240RVK01
4. Procedure
Subtask 34-10-00-860-081-D ** ON A/C NOT FOR ALL
A. Automatic IR Alignment Procedure
ACTION
RESULT
1.On Air Data/Inertial Reference System (ADIRS) Mode Selector Unit (MSU) panel 41VU:
  • Set the three OFF/NAV/ATT selector switches to NAV.
On ADIRS MSU panel 41VU:
  • It is possible that the OFF legend of the ADR1, ADR2 and ADR3 pushbutton switches flashes.
  • It is possible that the ON BAT light comes on.

On the upper ECAM Display Unit (DU):
  • The memo section shows IRS IN ALIGN > 7 MN (only if FMGC1 and FMGC2 are energized).

On the CAPT and F/O PFDs:
  • The CAS, vertical speed and altitude data come into view.
  • After approximately 40 seconds, the ATT warning flags go out of view and the attitude data come into view.

After approximately five minutes:
  • On the CAPT and F/O NDs, the HDG warning flags go out of view and the heading dial comes into view.

After approximately ten minutes:
  • On the upper ECAM DU, the IRS IN ALIGN 1 MN indication goes out of view (the Air Data/Inertial Reference Units (ADIRU) are in NAV mode).
Wait for approximately ten minutes.

NOTE: The GPS position is not correctly received by the ADIRUs, if the IRS IN ALIGN 1 MN indication flashes. In that case, you can enter an initialization position manually to do the IR alignment procedure (Ref. AMM TASK 34-10-00-860-004).
5. Close-up
Subtask 34-10-00-865-092-A ** ON A/C NOT FOR ALL
A. Close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUSATCOM240RVK01
Subtask 34-10-00-410-068-B ** ON A/C NOT FOR ALL
B. Close Access
   (1) On battery power center 105VU:
  • Install the protective cover and tighten the two screws.
   (2) Close access door 822.
   (3) Remove the access platform(s).
[Rev.10 from 2021] 2026.04.02 06:22:58 UTC
AVIA BRAIN PRODUCTION 2026