Fault of the IR Alignment A320
1. Possible Causes:
-wiring
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. 34-58-00-810-828-A | GPS PRIMARY LOST displayed on the NAV DISPLAY |
| Ref. AMM 34-10-00-860-004 | IR Alignment Procedure |
| Ref. AWM 34-11-44 | |
| Ref. AMM 34-12-34-000-001 | Removal of the ADIRU |
| Ref. AMM 34-12-34-400-001 | Installation of the ADIRU |
| Ref. AMM 34-14-00-740-004 | SYSTEM TEST of the Inertial Reference (IR) |
3. Fault Confirmation
SUBTASK 34-12-00-710-050-A
A. Test(s)
(1) Do the IR alignment procedure or the automatic IR-alignment procedure Ref. AMM 34-10-00-860-004:
(a) If the IR alignment is not satisfactory:
— Go to Para. Fault Isolation.
(b) If the IR alignment is satisfactory:
— No maintenance is necessary.
4. Fault Isolation
SUBTASK 34-12-00-810-050-A
A. If the test confirms the fault:
(1) Do the system test of the IR Ref. AMM 34-14-00-740-004:
(a) If the system test gives maintenance message(s):
— Do the related troubleshooting procedure.
(b) If the system test does not give maintenance message(s):
— Continue the troubleshooting.
SUBTASK 34-12-00-810-051-A
B. If the fault continues:
(1) Make sure that you enter the aircraft position (manually or automatically).
(2) Do a check:
— For the ECAM warning(s) NAV IR 1 FAULT and/or NAV IR 2 FAULT and/or NAV IR 3 FAULT, or
— On overhead panel 20VU, on the ADIRS CDU, if the IR1 FAULT and/or IR2 FAULT and/or IR3 FAULT light(s) come on.
(a) If the ECAM warning(s) NAV IR 1 FAULT and/or NAV IR 2 FAULT and/or NAV IR 3 FAULT is (are) shown or if the IR1 FAULT and/or IR2 FAULT and/or IR3 FAULT light(s) is (are) on:
— Replace ADIRU 1 and/or ADIRU 2 and/or ADIRU 3 Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001.
(b) If the ECAM warning(s) NAV IR 1 FAULT and/or NAV IR 2 FAULT and/or NAV IR 3 FAULT is (are) not shown or if the IR1 FAULT and/or IR2 FAULT and/or IR3 FAULT light(s) is (are) off:
— Continue the troubleshooting.
SUBTASK 34-12-00-810-052-A
C. If the fault continues:
(1) On overhead panel 20VU, on the ADIRS CDU, set the IR1, IR2 and IR3 selector switches to the ATT positions for a minimum of five seconds to disable the position comparison test.
(2) Do the IR alignment procedure or the automatic IR-alignment procedure Ref. AMM 34-10-00-860-004:
(a) If the IR alignment is satisfactory:
— No maintenance is necessary.
(b) If the IR alignment is not satisfactory:
— Continue the troubleshooting.
SUBTASK 34-12-00-810-053-A
D. If the fault continues:
(1) On the CAPT ND or the F/O ND, do a check for the message GPS PRIMARY LOST:
(a) If the message GPS PRIMARY LOST is shown, do the troubleshooting procedure Ref. TSM TASK 34-58-00-810-828:
1 If the GPS position is not available:
a On the MCDU, push the DATA mode key (the DATA INDEX page comes into view).
b On the MCDU, on the DATA INDEX page, push the line key adjacent to the GPS MONITOR indication (the GPS MONITOR page comes into view).
c On the MCDU, on the GPS MONITOR page, manually enter the PPOS.
d Do the IR alignment procedure Ref. AMM 34-10-00-860-004.
(b) If the message GPS PRIMARY LOST is not shown:
— Continue the troubleshooting.
SUBTASK 34-12-00-810-054-A
E. If the fault continues:
(1) On the MCDU, push the INIT mode key (the INIT A page comes into view).
(2) On the MCDU, on the INIT A page, push the line key adjacent to the IRS INIT indication (the IRS INIT page comes into view).
(3) In the IRS1 ALIGNING ON GPS and/or IRS2 ALIGNING ON GPS and/or IRS3 ALIGNING ON GPS field(s), do a check to see if the indication(s) is (are) shown as dashes:
(a) If one or more indications is (are) shown as dashes, do a check of the AUTO ALIGN ON GPS function:
1 If the AUTO ALIGN ON GPS function is not activated:
a Manually enter the PPOS.
b Do the IR alignment procedure Ref. AMM 34-10-00-860-004.
2 If the AUTO ALIGN ON GPS function is activated:
a Do a check and repair the wiring of ADIRU 1, ADIRU 2 and ADIRU 3 from pin AB to GND Ref. AWM 34-11-44.
b If the wiring is correct:
— Do the IR alignment procedure or the automatic IR-alignment procedure Ref. AMM 34-10-00-860-004.
c If the wiring is not correct:
— Continue the troubleshooting.
(b) If the indication(s) is (are) not shown as dashes:
— Continue the troubleshooting.
SUBTASK 34-12-00-810-055-A
F. If the fault continues:
(1) Do a check for the indications and the messages that follow:
On the upper ECAM DU, the IR IN ALIGN x MIN or the IR IN ALIGN memo(s) flashes green.
On the MCDU scratchpad, the messages:
— CHECK IRS/AIRPORT POS
— REF/GPS POS DIFF
— REF/LAST IRS POS DIFF
— REALIGN IRS MCDU.
On overhead panel 20VU, on the ADIRS CDU:
— The IR1 ALIGN and/or IR2 ALIGN and/or IR3 ALIGN indication light(s) flash(es).
(a) If one or more of these indication(s) or message(s) is (are) shown:
1 Do one of these steps to enter the correct PPOS:
a On the MCDU:
— Push the INIT mode key (the INIT A page comes into view).
— On the INIT A page, push the key adjacent to the IRS INIT indication (the IRS INIT page comes into view).
— On the IRS INIT page, enter the correct PPOS.
b On overhead panel 20VU, on the ADIRS CDU, enter the correct PPOS as follows:
— If the latitude value is 43°37.4’N, enter N4337.4 in the ADIRS CDU window, then push the ENT key.
— If the longitude value is 1°22.3’E, enter E001223 in the ADIRS CDU window, then push the ENT key.
2 Do the ADIRU alignment procedure Ref. AMM 34-10-00-860-004.
(b) If these indications and the messages are not shown:
— Continue the troubleshooting.
SUBTASK 34-12-00-810-056-A
G. If the fault continues:
(1) On the MCDU and/or the ADIRS CDU, if the message XCESS MOTION is shown:
— Do the IR alignment procedure after you stop the aircraft movement Ref. AMM 34-10-00-860-004.
