DOC AIRBUS | TSM A320FN2 not Below Idle Fault on EIU-2
TASK 73-25-00-810-B00-A
N2 not Below Idle Fault on EIU-2
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-539-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-401-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-163-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:48 UTC
N2 not Below Idle Fault on EIU-2
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AWM 291205 | |
| AWM 344202 | |
| AMM 34-42-33-000-001 | Removal of the Radio Altimeter Transceiver |
| AMM 34-42-33-400-001 | Installation of the Radio Altimeter Transceiver |
| AWM 732506 | |
| AMM 73-25-34-000-802 | Removal of the Engine Interface Unit (EIU) |
| AMM 73-25-34-400-802 | Installation of the Engine Interface Unit (EIU) |
| AMM 73-25-34-710-802 | Operational Test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) |
| AMM 73-25-34-860-803 | Engine Interface Unit (EIU) DISCRETE OUTPUTS Simulation |
Subtask 73-25-00-710-539-A ** ON A/C NOT FOR ALL
A. Do the operational test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) to confirm this fault AMM 73-25-34-710-802.
4. Fault IsolationSubtask 73-25-00-810-401-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
(1) On RELAY BOX (103VU):
(a) Replace RELAY-N2 SPEED CONDTN [2709GJ] AWM 291205.
(b) Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the XCVR (2SA2) AMM 34-42-33-000-001.
(3) On RELAY BOX (103VU), remove the relay (2709GJ).
(4) On MCDU, simulate the Discrete Output (DSO) 12:
(a) Push the adjacent button to DSO 12 to have the status equal to 1 AMM 73-25-34-860-803.
(b) At XCVR (2SA2) rack connector (AB), do a check for ground at contact 6K.
(c) At relay (2709GJ) socket, do a check for ground at contact Z.
(d) Stop the simulation of DSO 12 AMM 73-25-34-860-803.
(5) If there is no ground, do a check of wiring for continuity (less than 5 ohms resistance) and short to ground:
(a) If there is no ground at both contacts, do a check of wiring between EIU-2 (1KS2) rack contact 2F and (1862VT) on SHELF (86VU) AWM 732506.
(b) If there is no ground at contact of XCVR (2SA2) rack, do a check of wiring between contact 6K of XCVR (2SA2) rack and (1862VT) AWM 344202.
(c) If there is no ground at relay (2709GJ) socket, do a check of wiring between contact Z and (1862VT) AWM 291205.
(d) If you find damage, repair or replace wiring AWM 732506.
(e) If you find no damage:
1 Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
2 Do the test given in Para. 3.
(6) If there is ground at all contacts:
(a) Replace XCVR-RA, 2 [2SA2] AMM 34-42-33-000-001 and AMM 34-42-33-400-001.
(b) Install the relay (2709GJ).
(c) Do the test given in Para. 3.
5. Close-up(1) On RELAY BOX (103VU):
(a) Replace RELAY-N2 SPEED CONDTN [2709GJ] AWM 291205.
(b) Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the XCVR (2SA2) AMM 34-42-33-000-001.
(3) On RELAY BOX (103VU), remove the relay (2709GJ).
(4) On MCDU, simulate the Discrete Output (DSO) 12:
(a) Push the adjacent button to DSO 12 to have the status equal to 1 AMM 73-25-34-860-803.
(b) At XCVR (2SA2) rack connector (AB), do a check for ground at contact 6K.
(c) At relay (2709GJ) socket, do a check for ground at contact Z.
(d) Stop the simulation of DSO 12 AMM 73-25-34-860-803.
(5) If there is no ground, do a check of wiring for continuity (less than 5 ohms resistance) and short to ground:
(a) If there is no ground at both contacts, do a check of wiring between EIU-2 (1KS2) rack contact 2F and (1862VT) on SHELF (86VU) AWM 732506.
(b) If there is no ground at contact of XCVR (2SA2) rack, do a check of wiring between contact 6K of XCVR (2SA2) rack and (1862VT) AWM 344202.
(c) If there is no ground at relay (2709GJ) socket, do a check of wiring between contact Z and (1862VT) AWM 291205.
(d) If you find damage, repair or replace wiring AWM 732506.
(e) If you find no damage:
1 Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
2 Do the test given in Para. 3.
(6) If there is ground at all contacts:
(a) Replace XCVR-RA, 2 [2SA2] AMM 34-42-33-000-001 and AMM 34-42-33-400-001.
(b) Install the relay (2709GJ).
(c) Do the test given in Para. 3.
Subtask 73-25-00-860-163-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(1) Make sure that the work area is clean and clear of tools and other items.