DOC AIRBUS | TSM A320FLoss of the ADIRU1 and ADIRU2 Data on Engine 2
1. Possible Causes
· ADIRU-1 ( 1FP1 )
· ADIRU-2 ( 1FP2 )
· EEC ( 4000KS )
· LGCIU-2 ( 5GA2 )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
73-20-00-810-892-A Loss of the ADIRU1 Data on Engine 2
73-20-00-810-894-A Loss of the ADIRU2 Data on Engine 2
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 32-31-71-000-001 Removal of the LGCIU
Ref. AMM 32-31-71-400-001 Installation of the LGCIU
Ref. AMM 34-12-34-000-001 Removal of the ADIRU
Ref. AMM 34-12-34-400-001 Installation of the ADIRU
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
3. Fault Confirmation
Subtask 73-00-00-860-128-A
A. Job Set-Up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG/FADEC GND PWR/2 pushbutton switch.
Subtask 73-00-00-710-138-A
B. Test
(1) On the panel 50VU, push the ENG FADEC GND PWR 2 pushbutton switch and release it again.
NOTE: This action resets the FADEC memory.
(2) Adjust the brightness of the MCDU screen.
(3) Push the INIT mode key. The INIT page comes into view.
(4) Enter a new flight number.
(5) Start the engine 2 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 and let it become stable for 5
minutes.
NOTE: Operation of the engine for at least 3 minutes erases the LAST LEG REPORT related to the
last flight and the new fault is recorded in the EEC LAST LEG REPORT.
(6) Do a shutdown of the engine 2 by the discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(7) Read the LAST LEG REPORT of the FADEC (2A and 2B) menu on the MCDU (Ref. 70-00-00 Page
Block 301 Task Supporting Data).
(a) Make a record of the maintenance message.
(b) Make a record of the channel FADEC 2A or FADEC 2B which found the fault.
(8) Fully decrease the brightness of the MCDU screen (display off).
4. Fault Isolation
Subtask 73-00-00-810-163-A
A. If the test gives the maintenance message :
· ADIRS1/ADIRS2/EEC2 and
· ADIRS1/HC/EEC2
Do the trouble shooting procedure (Ref. TSM 73-20-00-810-892) .
Subtask 73-00-00-810-164-A
B. If the test gives the maintenance message :
· ADIRS1/ADIRS2/EEC2 and
· ADIRS2/HC/EEC2
Do the trouble shooting procedure (Ref. TSM 73-20-00-810-894) .
Subtask 73-00-00-810-095-A
C. If the test gives the maintenance message ADIRS1/ADIRS2/EEC2:
· replace the ADIRU-1 ( 1FP1 ) Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001 .
(1) If the fault continues:
· replace the ADIRU-2 ( 1FP2 ) Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001 .
(2) If the fault continues:
· replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 73-00-00-810-267-A
D. If the test gives the maintenance message ADIRS1/ADIRS2/LGCIU:
· Replace the ADIRU-1 ( 1FP1 ) Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001 .
(1) If the fault continues:
· Replace the ADIRU-2 ( 1FP2 ) Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001 .
(2) If the fault continues:
· Replace the LGCIU-2 ( 5GA2 ) Ref. AMM 32-31-71-000-001 and Ref. AMM 32-31-71-400-001 .
Subtask 73-00-00-710-139-A
E. Do the test given in Para. 3.
5. Close-up
Subtask 73-00-00-860-129-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG/FADEC GND PWR/2 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:36:07 UTC