Installation of the Engine Interface Unit (EIU) [CFML]

TASK 73-25-34-400-803-A
Installation of the Engine Interface Unit (EIU)

ZONE: 120
FIN: 1KS1
FIN: 1KS2

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
TASK 73-25-34-710-805-A	Operational Test of the Engine Interface Unit (with CFDS)
TASK 73-25-34-860-808-A	Check and Uploading of the Engine Interface Unit (EIU) Software
TASK 73-25-34-860-809-A	Engine Interface Unit (EIU) DISCRETE INPUTS Menu Data Status
TSM 73-25-01-810-848	No EIU 1 Response on MCDU Screen at Entry in Interactive Mode
TSM 73-25-01-810-849	No EIU 2 Response on MCDU Screen at Entry in Interactive Mode
Engine Interface Unit (EIU)

3. Job Set-up
Subtask 73-25-34-010-060-A

A. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(2) Make sure that access door 824 is open (Ref. AMM TASK 52-41-00-010-002).

Subtask 73-25-34-865-102-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	ANTI ICE/RAIN/RPLNT/CAPT	1DB1	D01
49VU	COM/CVR/SPLY	23RK	E14
49VU	COM/CVR/CTL	26RK	E13
121VU	RCDR/DFDR	7TU	K39
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
122VU	ANTI ICE/RAIN/RPLNT/F/O	1DB2	W11
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
FOR FIN: 1KS1 (EIU1)
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 1KS2 (EIU2)
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 73-25-34-865-103-A

WARNING: MAKE SURE THAT YOU OPEN THE CIRCUIT BREAKERS AS FOLLOWS:

1JH AND 3JH1 BEFORE 2KS1
1JH AND 3JH2 BEFORE 2KS2.

IF YOU DO NOT OBEY THIS SEQUENCE, THERE IS A RISK OF ELECTROCUTION. THIS IS BECAUSE YOU WILL START CONTINUOUS IGNITION IF YOU OPEN CIRCUIT BREAKER 2KS1 OR 2KS2 FIRST.

WARNING: MAKE SURE THAT THE PROBE HEATER AND WINDOW HEATER CIRCUIT-BREAKERS ARE OPEN BEFORE YOU OPEN THE PHC AND WHC CIRCUIT BREAKERS. IF YOU DO NOT OBEY THIS SEQUENCE:

THE PROBES WILL BECOME TOO HOT.
THIS CAN CAUSE INJURY TO MAINTENANCE PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
FOR FIN: 1KS1 (EIU1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 1KS2 (EIU2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

4. Procedure
Subtask 73-25-34-420-055-A

A. Installation of the Engine Interface Unit (EIU)
(1) Remove the blanking caps and make sure that the electrical connectors (6) and (7) are in good condition.
(2) Put the engine interface unit (1) in its support (2).
(3) Push the engine interface unit (1) with the handle (3) until the connector (6) engages correctly.
(4) Engage the knurled nut (5) in the hook (4) and tighten them.

5. Close-up
Subtask 73-25-34-860-124-A

A. If the installed EIU is new or returned from shop, there is a risk that no software is uploaded. Do a check and uploading of the EIU software.
(1) Do a check of the EIU software (Ref. AMM TASK 73-25-34-860-808).
(a) If the EIU 1 and EIU 2 does not respond when you select it on Multipurpose Control & Display Unit (MCDU) screen:
1 Upload the EIU software (Ref. AMM TASK 73-25-34-860-808).
2 Do again the check of the EIU software (Ref. AMM TASK 73-25-34-860-808).
3 If the EIU 1 and EIU 2 does not respond when you select it on MCDU screen TSM 73-25-01-810-848 and TSM 73-25-01-810-849.
(b) If the EIU 1 and EIU 2 responds when you select it on MCDU screen, make sure that EIU 1 and EIU 2 have the same operational software version. You have to do the LRU identification on EIU 1 and EIU 2.

Subtask 73-25-34-865-104-A

WARNING: CLOSE THE CIRCUIT BREAKERS AS FOLLOWS:

2KS1 BEFORE 1JH AND 3JH1
2KS2 BEFORE 1JH AND 3JH2.

IF YOU DO NOT OBEY THIS SEQUENCE, YOU WILL START CONTINUOUS IGNITION AND THERE IS A RISK OF ELECTROCUTION.

WARNING: CLOSE THE CIRCUIT BREAKERS RELATED TO THE PHC AND CIRCUIT BREAKER 4KS1(2) BEFORE YOU CLOSE THE PROBE HEATER CIRCUIT-BREAKERS. IF YOU DO NOT OBEY THIS SEQUENCE:

THE PROBES WILL BECOME TOO HOT.
THIS CAN CAUSE INJURY TO MAINTENANCE PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM/CVR/SPLY	23RK	E14
49VU	COM/CVR/CTL	26RK	E13
FOR FIN: 1KS1 (EIU1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 1KS2 (EIU2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

Subtask 73-25-34-865-105-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
49VU	ANTI ICE/RAIN/RPLNT/CAPT	1DB1	D01
121VU	RCDR/DFDR	7TU	K39
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
122VU	ANTI ICE/RAIN/RPLNT/F/O	1DB2	W11
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
FOR FIN: 1KS1 (EIU1)
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 1KS2 (EIU2)
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 73-25-34-710-071-A

D. Test(s)
(1) Do an operational test of the EIU with the centralized fault display system (Ref. AMM TASK 73-25-34-710-805).
(2) In case of Landing Gear Control and Interface Unit (LGCIU) failure reported, do the troubleshooting of these failures before continuing the procedure.
(3) Check that EIU discrete inputs from LGCIU are correct through EIU discrete inputs menu data status (Ref. AMM TASK 73-25-34-860-809):

OIL LOW PRESS SW = 1
LHMLG COMP = 1
RHMLG COMP = 1.

If one of the previous discrete is not correct, contact Airbus support.

Subtask 73-25-34-410-055-A

E. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 03:05:51 UTC