DOC AIRBUS | TSM A320FLoss of the ADIRU2 Data on Engine 2
1. Possible Causes
· ADIRU-2 ( 1FP2 )
· wiring from the EEC (4000KS) to the ADIRU2 (1FP2)
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
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 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 71-13-00-010-010 Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
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)
Ref. ASM 73-25-10
ADIRU 2 SHEET 1
Figure 73(IAE)-20-00-991-00700-A / SHEET 1/1 - ADIRU 2 not printed, as per printing preferences
3. Fault Confirmation
Subtask 73-20-00-860-072-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 73-20-00-710-194-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 and the scheduled maintenance 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
(Ref. Fig. ADIRU 2 SHEET 1)
Subtask 73-20-00-810-158-A
A. If the test gives the maintenance message ADIRS2/HC/EEC2:
· replace the ADIRU-2 ( 1FP2 ) Ref. AMM 34-12-34-000-001 and Ref. AMM 34-12-34-400-001 .
(1) If the fault continues:
· open the fan cowls 447AL and 448AR Ref. AMM 71-13-00-010-010
· do a check and repair the wiring from the EEC (4000KS) to the ADIRU2 (1FP2) :
. pins J1/R, N to pins AA/14B, 14D
. pins J7/R, N to pins AA/14B, 14D Ref. ASM 73-25-10.
(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 73-20-00-710-195-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 73-20-00-860-073-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 PWR2 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 04:36:14 UTC