Removal of the Engine Interface Unit (EIU) [IAE]

TASK 73-25-34-000-041-A
Removal of the Engine Interface Unit (EIU)

FIN: 1KS1 ** ON A/C NOT FOR ALL
FIN: 1KS2 ** ON A/C NOT FOR ALL

1. Reason for the Job
The procedure is the same for the engine interface unit 1KS1 and 1KS2.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
Engine Interface Unit

3. Job Set-up
Subtask 73-25-34-865-061-A ** ON A/C NOT FOR ALL

WARNING: BEFORE YOU OPEN PHC CIRCUIT BREAKERS 2DA1(2,3), OPEN PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3). IF YOU DO NOT OBEY THIS SEQUENCE: - THE PROBES WILL BECOME TOO HOT. - THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

WARNING: OPEN CIRCUIT BREAKERS 2KS1 AND 2KS2 AFTER YOU OPEN THE IGNITION CIRCUIT BREAKERS. IF NOT, THE CONTINUOUS IGNITION SYSTEM WILL BE ACTIVATED.

A. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14
49VU	ANTI ICE/RAIN/RPLNT/CAPT	1DB1	D01
122VU	ANTI ICE/RAIN/RPLNT/F/O	1DB2	W11
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
121VU	RCDR/DFDR	7TU	K16
49VU	COM/CVR/SPLY	23RK	E14
49VU	COM/CVR/CTL	26RK	E13
FOR FIN: 1KS1 (EIU1)
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
FOR FIN: 1KS2 (EIU2)
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05

Subtask 73-25-34-865-089-A ** ON A/C NOT FOR ALL

WARNING: OPEN THE PROBE HEATER AND WINDOW HEATER CIRCUIT-BREAKERS 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 DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
122VU	ANTI ICE/WHC/2	5DG2	W13
122VU	ANTI ICE/WHC/1	5DG1	X13
122VU	ANTI ICE/PROBES/PHC/3	2DA3	Y16
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12

Subtask 73-25-34-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position
(2) Open the access door 824 (Ref. AMM TASK 52-41-00-010-002)

4. Procedure
Subtask 73-25-34-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Engine Interface Unit.
(1) Loosen the knurled nuts (5).
(2) Lower the knurled nuts (5) to free the hooks (4).
(3) Pull the engine interface unit (1) with the handle (3) until the connector (6) is disconnected.
(4) Remove the engine interface unit (1) from its support (2).
(5) Put the CAP - BLANKING on the electrical connectors.

[Rev.10 from 2021] 2026.04.01 03:01:31 UTC