ICU A and B Supplies Fault on EIU-2

TASK 73-25-00-810-A17-A
ICU A and B Supplies Fault on EIU-2

1. Possible Causes

EIU-2 [1KS2]
aircraft wiring

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
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)
AWM 783605

3. Fault Confirmation
Subtask 73-25-00-710-454-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 Isolation
Subtask 73-25-00-810-281-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Check on report for any failure of normal BUS bar (202PP) and (204PP).
(a) Troubleshoot as necessary (Ref. TSM Chap. 24).
(b) Do the test given in Para. 3.
(c) If no fault regarding the BUS bar is reported or if fault continues, go to the Para. 4.C.

Subtask 73-25-00-865-067-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ICU B/ENG2 PWR SPLY	101KS2	R43
121VU	ICU A/ENG2 PWR SUPPLY	22KS2	R40

Subtask 73-25-00-810-282-A ** ON A/C NOT FOR ALL

C. If no fault regarding the BUS bar is reported or if fault continues:
(1) Remove EIU-2 [1KS2] AMM 73-25-34-000-802.
(2) Close both circuit breakers. Refer to the Para. 4.D.
(3) Check for 28 VDC at pins 13A and 13C of connector AB on 85VU.
(4) Open both circuit breakers. Refer to the Para. 4.B.
(5) If any damage found:
(a) Repair or replace aircraft wiring AWM 783605.
(6) If no problem is found or if fault continues:
(a) Replace EIU-2 [1KS2] AMM 73-25-34-400-802.
(b) Make sure that the both circuit breakers are closed. Refer to the Para. 4.D.
(c) Do the test given in Para. 3.

Subtask 73-25-00-865-069-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ICU B/ENG2 PWR SPLY	101KS2	R43
121VU	ICU A/ENG2 PWR SUPPLY	22KS2	R40

[Rev.8 from Aug 2018] 2026.04.04 04:36:27 UTC